fejkdata/todo.md

todo

Scoring

Score = -R - S/4 + 2*A + 2*G*W

Bar = 9

Next ID = 170

Goal	W
1	1.00
1.1	1.00
2	0.95
2.1	0.95
2.2	0.95
2.3	0.95
3	0.90
3.1	0.90
3.2	0.90
3.3	0.90
3.4	0.90
4	0.85
4.1	0.85
5	0.80
5.1	0.80
5.2	0.80
5.3	0.80
5.4	0.80
5.5	0.80
5.6	0.80
5.7	0.80
5.8	0.80
5.9	0.80
6	0.75
6.1	0.75
6.2	0.75
7	0.70
7.1	0.70
7.2	0.70
7.3	0.70
8	0.65
9	0.60
9.1	0.60
9.2	0.60
9.3	0.60
9.4	0.60
9.5	0.60
9.6	0.60
10	0.55
10.1	0.55
11	0.50
12	0.45
12.1	0.45
12.2	0.45
12.3	0.45
13	0.40
13.1	0.40
14	0.35
15	0.30
16	0.25

Items

ID	Release	Exempt	Item	R	S	A	G	Goals	Score
77	0.1.0	decision	Split the shipped data into Go modules per locale and country, which a library imports by choice, and embed every one in the CLI.	5	10	10	10	2, 1.1, 9	32.5
78	0.1.0	decision	Ship 10% of every place's streets, at least 10, and 10% of all US places drawn by population, each place weighted by population.	6	7	10	10	2, 14	31.2
61	0.1.0		Add a locale, with its geo/ tree, for each of the ten most-spoken languages and each Nordic country.	4	9	9	10	2.1	30.8
16	0.1.0		Add locale categories: company, phone, finance, vehicle, words.	3	8	8	9	2.2, 15	28.1
15	0.1.0		Add misc tables and templates, one row of its detail's table per chunk.	3	9	8	8	2, 15, 14	25.9
129	0.1.0	decision	Take a template wherever the library renders, so fake:"{/sv_SE.person.first}" and Fake("{/sv_SE.person}") render, and text with no {…} prints as written, as the CLI already does.	5	8	8	10	5.9, 7	25.0
163	0.1.0		Lift the CLI's --repeat cap, since the CLI streams each render, and give the builtins' count and decimal caps a technical reason in the README.	2	2	7	7	2, 5.7	24.8
57	0.1.0		Rewrite CHANGELOG.md's [Unreleased] as what v0.1.0 holds.	1	2	6	6	1.1	22.5
153	0.1.0	decision	Run the nine-seat comprehension panel and the scoring run again once items 148 and 151 have merged, and file what the panel names.	1	3	3	9	3	20.4
164	0.1.0		Let a table's format or a cell bind a name, which lives in that format or cell and keeps one pick through the draw.	2	2	5	7	4.1, 5.3	19.4
157	0.1.0		Show in the README's CLI section how PowerShell and cmd.exe pipe a template, one line per shell family.	1	1	5	6	7.2	17.1
167	0.1.0		Lower the reading cost of the files a chunk reads most before its first commit.	1	3	2	8	3, 3.4	16.6
89	0.1.0		Fail New without WithSeed, naming the option, and seed the CLI from the system.	3	3	6	7	10.1	16.0
165	0.1.0		Let a table carry name with neither key nor parent, and list the rows a name matches by their line where it matches several.	2	2	4	6	5.7	15.1
127	0.1.0		Give a Swedish street only postal codes whose delivery digit means street or rural delivery, dropping codes whose delivery digit is 9, or record why they stay.	3	3	4	6	4	14.4
110	0.1.0		Refuse an empty segment in a path Fake and FakeRecord take, as a reference does: sv_SE.person. reports path has an empty segment.	1	1	3	6	6	13.8
166	0.1.0		Let a key or name cell hold a bracket, a brace, a double quote or a pipe, so the table loads, its row draws at random, and only a selector cannot reach it.	2	2	3	6	5.7	13.1
151	0.1.0		Load a caller's path and walk it in one Generator method, so no entry point walks the root before the shipped category the path names has loaded.	2	2	1	6	3.2	10.3
58	0.2.0		Ship prebuilt binaries, a container image, and packages for Homebrew, Scoop and the biggest Linux package managers, so the CLI needs no Go.	3	7	8	9	1.1, 7	29.2
113	0.2.0	defect	Draw {iban(CC)} with its country's national check digits, and SE's with a real bank's id, so a validator checking more than mod 97 accepts it.	3	5	7	9	4	25.0
154	0.2.0		Add en_US.routing, an ABA routing number over the Fed's prefix ranges with its check digit drawn by {aba()}.	2	2	6	7	2.2, 15	22.8
155	0.2.0		Add misc.isin and misc.cusip, built by their structure rules with their check digits drawn by {isin()} and {cusip()}.	2	2	6	7	2, 15	22.8
26	0.2.0	defect	Spell sv_SE.personnummer with the + Skatteverket uses from the year the holder turns 100, judged by a date the caller gives.	4	6	7	8	4	22.1
34	0.2.0		Add {isin()}, {cusip()}, {aba()} and {vin()}.	2	4	6	7	4	20.9
81	0.2.0	decision	Refuse at load every calc operand not proven numeric and every divisor not proven nonzero, in a string column too.	4	4	6	8	6.1, 4	20.6
91	0.2.0		Accept a path through a name as a calc operand, so {/misc.coordinate as c}{c}: {calc(c.lat * 60)} computes from the coordinate {c} prints.	3	4	6	7	4.1, 5.3	19.9
36	0.2.0		Report every mistake a load finds in one error, as the decision "A load reports every mistake at once" states.	5	6	7	8	6	19.5
88	0.2.0		Add a 12-digit YYYYMMDDNNNC form of sv_SE.personnummer and sv_SE.samordningsnummer, the form Skatteverket's testpersonnummer series and many systems store.	2	3	6	6	4	19.4
41	0.2.0	decision	Key every table by one key column, as the decision "A table selects by one key column, a code, never a free-form name" states.	6	7	7	8	5.5	19.1
52	0.2.0		Name the file a link error comes from beside its category path, sub.x (/d/a/sub/x.json): ….	1	2	5	7	6	19.0
117	0.2.0		List the fields of what a path has reached when its next segment names one that is not there: {/word as a}{a.zz} reports no field "zz"; word has w.	1	2	5	7	6	19.0
28	0.2.0	decision	Accept a middle name, and draw a personnummer whose sex matches a sex selected through a named pick.	4	4	6	7	4.1	18.9
24	0.2.0	defect	Stop misc.territory[EH].tld rendering .eh, the one shipped TLD misc.tld does not hold.	1	1	4	7	4	18.6
92	0.2.0		Name the hyphenated field in a calc's refusal, and say to rename it: today {calc(postal-code * 2)} reports no field "postal".	1	2	5	6	6	17.5
53	0.2.0		Let a table column carry a datatype, so --format json writes "safe": true and --format sql a boolean.	4	5	6	6	4	16.9
55	0.2.0		Document NewRecordTemplate, ErrNoColumns and MaxRepeat in the README's Library section.	1	2	6	7	12	16.8
18	0.2.0		Give the address records one column set across countries: region and municipality as columns on geo.SE.address too.	4	4	6	6	5	16.6
44	0.2.0	decision	Have misc.tld[se] select the row keyed .se, or have its miss name [.se].	1	1	4	6	6	15.8
54	0.2.0	defect	Read the tag through git/ref/tags/{tag} in publish_release.py.	2	1	3	6	1.1	15.8
31	0.2.0		Rename misc.territory.country to sovereign.	3	2	4	7	5.8	15.7
20	0.2.0	defect	Weight sv_SE.sex and en_US.sex by bearers, as the README's Data section says they are.	2	2	4	6	4	15.7
50	0.2.0		Reword prove's refusal of a typed column reading a row, {/region}.	1	2	4	6	6	15.5
17	0.2.0		Give every shipped category a column for each part its format composes, and one record shape across the national ids; re-pin the shape.	5	6	6	6	5	15.1
29	0.2.0		Let a path go from a selected row into the template beside its family: geo.US.locality[1714000].address.	4	4	5	6	5	14.6
42	0.2.0		Refuse a struct tag's datatype other than its Go type's before proving its values, as the README's Library section promises.	2	2	4	6	6	14.5
32	0.2.0		Add misc.browser as the parent of misc.useragent, so misc.browser[Chrome].useragent resolves.	3	3	4	6	4.1	14.4
22	0.2.0		Give url and email a path that draws only domains nobody can register, keeping the wide set as the default.	3	4	7	8	16	14.0
46	0.2.0		Report the same error every load for a table with two bad options.	2	2	3	7	6, 10	14.0
158	0.2.0		Drop a UTF-8 byte order mark that starts stdin, and say in the README how to stop PowerShell 5.1 sending Göteborg as G?teborg.	2	2	4	5	7.2, 5.1	13.5
79	0.2.0	decision	Beside a --data-path, load in New the user's categories, the shipped ones they override or read, and the shipped ones whose reads reach an overridden one; load the rest on first reach.	6	6	7	8	13	12.9
27	0.2.0		Merge en_US.ip and sv_SE.ip, today byte-identical, into one misc.ip.	3	2	4	6	8	12.3
107	0.2.0	decision	Move the template engine into internal/, leaving the root the public API and its options.	6	9	3	8	3.2, 3.4	12.2
168	0.2.0	principle	Test the shared steps of data-import/ in the merge gate, starting with geo.fence.	2	4	2	6	3	11.8
161	0.2.0		Let a field whose name starts or ends with whitespace be bound to a name, or refuse such an identifier, so { x as p} means one thing.	2	2	2	6	5.6, 4.1	11.7
112	0.2.0		Check a calc's field operands where its template resolves, beside its name operands, once item 36 reports every mistake at once.	2	2	1	6	3.2	10.3
108	0.2.0	defect	Name item 26 in the decision "No builtin reads the clock, so a date is bounded by days, never by an age", as the item that ends its conflict with goal 4.	1	1	1	4	3.4	8.0
169	0.2.0	question	Reword the decision "A parent row with no child row is a load error" to say what each geo import does with such a row: drop it, or exit where geo-se.py would lose a kommun or a län.	1	1	1	4	3	8.0
38	0.3.0	defect	Compare calcParser.binary's operator as a rune.	1	1	3	6	6	13.8
45	0.3.0		Name the node a selector follows in childNamed's refusal.	1	1	3	6	6	13.8
49	0.3.0		Report a CRLF rows file holding only its header as having no rows.	1	1	3	6	6	13.8
13	0.3.0	defect	Place xlsx cells by their r reference in data-import/xlsx.py.	2	2	3	6	4	13.7
39	0.3.0		Stop the columnKinds suggestion naming a field's own kind or a narrower one.	1	2	3	6	6	13.5
51	0.3.0		Spell a table one way across the errors that name it.	1	2	3	6	6	13.5
115	0.3.0		Spell a rows file's line one way in every error, naming the file.	1	2	3	6	6	13.5
14	0.3.0		Spell misc.creditcard's digit runs {digits(n)}.	2	2	4	6	8	13.3
11	0.3.0		Test that every geo tree holds the five table names and the address columns that port across countries.	1	2	3	5	4	13.0
35	0.3.0		Add {base64url(n)} for JWT shapes.	1	2	4	5	8	13.0
40	0.3.0		Parse defaultTable's path with the library's grammar.	2	2	3	5	3.2	12.5
21	0.3.0		List title in both locales, and sv_SE's birth-number, in the README's Data list of what each locale carries.	1	1	4	6	12	12.2
86	0.3.0		Read both en_US.phone formats' area codes from one category, as their exchange reads en_US.phone-exchange.	1	2	2	5	3.2	11.5
23	0.3.0		Give every other shipped category that could reach something real a path that never does.	3	6	6	7	16	11.0
75	0.3.0		Run every README sh, go and text example as a test, and compare each "Renders" line to a seeded render.	2	6	4	7	12.2	10.8
33	0.3.0		Group data/misc into folders where a group name makes a path easier to guess.	4	5	4	5	5	10.8
72	0.3.0	principle	Fail the merge gate when test coverage falls below the last recorded figure.	2	3	2	5	3	10.2
30	0.3.0		Draw email.local from username, so the two share one handle list.	2	2	3	5	8	10.0
95	0.3.0	principle	Hold a struct's columns and the field each fills in one slice.	1	2	1	5	3.2	9.5
116	0.3.0		Turn a row index into its rows file's line in one function.	1	2	1	5	3.2	9.5
19	0.3.0		Fill the 398 Swedish localities weighted 200 from SCB småorter.	2	4	4	6	14	9.2
56	0.3.0	defect	Build on a manual run of test.yml.	1	1	1	4	1	8.8
109	0.3.0	principle	Indent every script under data-import/ with hard tabs, as AGENTS.md requires and release-tooling/ does.	2	4	1	4	3	6.2
63	0.4.0		Pair a street with its exact postnummer.	3	6	5	8	4.1	19.1
62	0.4.0		Add {btc()} and {eth()}.	2	4	4	6	4	15.2
59	0.4.0		Promise in Generator's godoc that its renders run one at a time.	1	1	5	5	12	13.2
65	0.4.0		Hold every change AGENTS.md says owes a CHANGELOG.md entry to one in CI.	2	3	4	5	5.8	13.2
66	0.4.0		Cut the README's Layout block to the lines that say what a file name cannot.	1	1	2	5	3.4	11.8
67	0.4.0		Cut AGENTS.md to the rules only it states, and explain every term its comprehension rule uses.	1	2	1	6	3.4	11.3
64	0.4.0		Give every entry in docs/decisions.md the goal it serves, its date, who made it and the premise it rests on.	1	4	1	6	3.4	10.8
68	0.4.0	decision	Make gitea.larvit.se/larvit/fejkdata a pull mirror of GitHub.	2	1	1	3	1.1	5.8
69	1.0.0		Announce v1.0.0 where a developer choosing a fake-data tool already reads, with a README first screen for someone deciding in a minute.	1	3	7	9	1.1	30.2
70	1.0.0		Publish a homepage with an in-browser generator, the library compiled to WebAssembly.	3	6	6	6	1.1	19.5

Details

77. Split the shipped data into Go modules per locale and country, which a library imports by choice, and embed every one in the CLI.

The CLI binary may grow to hundreds of MB. The maintainer decided on 2026-10-04, under goals 2.3, 6.2, 7.3, 9 and 10.1:

• One module per locale, one per country's geo/ tree, and one for misc. A module registers nothing when imported.
• A bare New() loads no data and fails, naming the option to add. WithoutShippedData goes.
• A data module is an fs.FS passed to WithDataFS, as anyone's data is, and New takes several. A module carrying functions loads through an option of its own, so a data module that starts carrying functions breaks its users. Such a function reaches the randomness through an interface the root declares; internal/drawstate's type stays internal.
• A module names, in a manifest, every module it reads by default, directly or through another, so the first error names the whole set to import. A manifest is optional: a --data-path folder without one is a module. A read nothing provides fails, naming the module that provides that path by default or saying none does. Nothing loads a default on its own, and anything providing the same paths stands in.
• A module's manifest names the fejkdata version it was built for, and a mismatch fails in New, naming the go get line that aligns them. Each shipped module requires the core at its own version.
• Every shipped module releases in lockstep, under one version number, so the README's one version still covers the library, the CLI and the data. CI cuts one tag per module per release, which revises the decision "The changelog heading is the one spelling of a release; CI cuts the tag".
• Two sources defining one name fail to load, unless an option says the second replaces the first; every read of that name, a shipped module's included, then reads the second. In the CLI, a flag standing on its own, benched with the data and hand fixture authors, does the same for a --data-path, so flags still go anywhere on the line. This revises the decisions "A --data-path override rebinds every reference to the category it replaces" and "With only the shipped set, a category loads on the first call reaching it; beside a --data-path, every category loads in New".
• The builtins stay in fejkdata itself. A module's function asks for the inputs it needs through one generic mechanism, and gets the randomness and the date the generator uses. The README asks for functions with no side effects of their own.
• The CLI is a library call. One exported list names every shipped module, and fejkdata's own main passes it to that call. The list lives where no library user's module graph pulls in every shipped module, and the architect places it. A custom CLI is the same few lines with other modules added, and no code exists only for custom CLIs. A README section shows it with example code, and the README's Library quick start shows the whole import block for one locale. The README's Versioning section gives each module's tag spelling, and says to pin every fejkdata module at one version.

Split it into items before starting. Before the module API ships, a panel of the README's audience personas tries pulling in data with it.

78. Ship 10% of every place's streets, at least 10, and 10% of all US places drawn by population, each place weighted by population.

Needs item 77. Ten streets per place crowds 500 Stockholm customers onto ten streets. geo-se.py and geo-us.py keep 10% of each place's streets, at least 10. geo-us.py draws 10% of every Census place, down to the smallest village, picking each with odds by population, and every table weights a place by its population, so a draw is not mostly tiny villages. Replaces the decision "The default embed holds every Swedish postort the import can place and give a street-delivery code and a street, and the US places of 25,000 or more", which the maintainer withdrew on 2026-10-03. Re-pin seeded output and the shape in their own commits.

61. Add a locale, with its geo/ tree, for each of the ten most-spoken languages and each Nordic country.

Pick the ten from a published ranking of languages by total speakers, such as Ethnologue's, each in the country where it has the most speakers, and record the ranking in the decision that names them. The Nordic ones are sv_SE (shipped), nb_NO, da_DK, fi_FI and is_IS. A second country reading GeoNames' postal codes moves geonames() from geo-se.py, and the nearest-centroid street assignment in its streets(), into geo.py. Each locale carries goal 2.2's categories, and its address reads its country's geo/ tree by reference. rows.Pins holds eight pins inline, sized for a five-deep geo tree; a deeper tree needs more to keep a render off the heap.

16. Add locale categories: company, phone, finance, vehicle, words.

Shape: T = table, t = template, c = choice.

sv_SE (source research)

Category	Shape	Source	Licence
person title, birthdate, age, blood type weighted	t	geblod.nu distribution	facts
organisationsnummer by form, vat	t	Bolagsverket group digits, Luhn, SE…01	facts
company name patterns, legal form weighted	t	Bolagsverket registrations 2025	CC BY 2.5 SE
sni industry codes	T	SCB SNI 2025	"Källa: SCB"
ssyk occupations	T	SCB SSYK 2012	"Källa: SCB"
phone mobile, fixed per area code, E.164	T+t	PTS numbering plan 2024	facts
bankgiro, plusgiro, bankaccount clearing + Luhn/mod-11	T+t	Bankinfrastruktur CSV, Bankgirot rules	facts
licenseplate ABC 123, ABC 12A, blocked combinations	t	Transportstyrelsen	facts
car make, model weighted by registrations	T	Mobility Sweden 2025	cite
word noun, verb, adjective, adverb; sentence	T+t	SALDO	CC BY 4.0
month and weekday names, holiday	t+T	CLDR sv, lag 1989:253	Unicode
territory localised names keyed by alpha2	T	CLDR sv territory names	Unicode

en_US (source research, and part1–part4)

Category	Shape	Source	Licence
ein valid ranges	t	IRS	facts
company names, suffix, naics	t+T	SEC tickers for patterns, NAICS 2022	public domain
phone NANP with valid NPA (the NXX ships as en_US.phone-exchange)	t	NANPA rules	facts
bankaccount	t	—	—
licenseplate per state	T	hand-authored patterns	facts
car make, model	T	NHTSA vPIC	public domain
word, sentence, paragraph	T+t	Moby POS or WordNet	public domain / WordNet
month and weekday names, holiday	t+T	CLDR en	Unicode

15. Add misc tables and templates, one row of its detail's table per chunk.

Shape: T = table, t = template, c = choice.

Category	Shape	Source	Licence
ip v4 documentation ranges, private, CIDR; ipv6 2001:db8::/32; mac locally administered	t	RFC 5737, 1918, 9637	facts
creditcard per network: IIN, length, CVV, expiry	T+t	network rules, {luhn()}	facts
bic	t	structure rules	facts
ean, upc, gtin, isbn, issn, imei, asin, sku	t	check-digit rules, GS1 demo prefix 952	facts
product name, adjective, material, department, garmentsize	T/c	LLM-written lists	—
airport IATA, ICAO, territory, municipality; airline; aircraft; flight, seat, pnr	T+t	OurAirports, Wikidata	public domain, CC0
element, unit, planet	T	PubChem, BIPM, NASA	public domain, CC BY 4.0
animal by class, plant	T	Wikidata	CC0
bloodtype weighted (global)	c	AABB	facts
color named, hex, rgb, hsl, cmyk	T+t	CSS Color 4, XKCD	W3C, CC0
programminglanguage, os, browser, database column/type/engine, fileext	T/c	Linguist, curated	MIT
commit message, branch, sha	t	LLM-written, {hex(40)}	—
password, hash, jwt, slug, hostname, avatar, placeholderimage	t	shapes	—
book title, author; genre; instrument; dish, ingredient	T	Gutenberg catalog, MusicBrainz, USDA	CC0
lorem, hacker, hipster, catchphrase, buzzword, quote	T/c	lorem ipsum, LLM-written	—
direction, continent, ulid	c/t	—	—

129. Take a template wherever the library renders, so fake:"{/sv_SE.person.first}" and Fake("{/sv_SE.person}") render, and text with no {…} prints as written, as the CLI already does.

Goal 5.9. Today a path is a second spelling of the template that reads it; afterwards only the template remains.

• A lone reference, a template of one reference token and nothing else, is what it references, as a record column reading one reference already is: FakeRecord("{/users}") returns the columns of users. The CLI's loneReference and the isPath check it copies from the token grammar then go, and --format sql takes its default --table from the library's parse of the reference.
• Fake and FakeRecord take a template. FakeTemplate folds into Fake, FakeRecordTemplate into FakeRecord, and IsTemplate goes, with grammar.IsTemplate.
• Fake of a lone reference costs what Fake of its path costs today, and the allocation gate holds a case for it.
• List and --list give each entry as the template that renders it, {/sv_SE.person}.
• Text that is not a JSON value and holds no {…} prints as written (goal 5.1), in a string field's struct tag and Fake alike, as stdin's text does in the CLI: Fake("sv_SE.person") returns sv_SE.person. CHANGELOG.md says that a path with no {…} prints as its text. A struct tag's - still skips its field.
• Where text with no {…} is refused, as a record or in a typed struct field, and it spells a path the data offers, the error names {/that.path}.
• A lone reference to nothing exits 2 under --format, where it exits 1 today.
• A lone reference written as an object holding only a format, {"format":"{/users}"}, or as a one-item choice, ["{/users}"], names the record as {/users} does.
• A struct tag of a bare JSON number or boolean, fake:"42", renders its text, as stdin and NewTemplate already do.
• grammar.CallerPath, which strips a path's leading /, goes with the path spelling, and so does the README's Library line allowing it.
• Decide whether a lone reference under --format draws as its path draws today or as a template draws: under one seed, drawing users as a path and as the template {/users} picks different rows.
• This revises the decisions "A struct tag is a template by its shape", "FakeTemplate and NewTemplate both stay", "--list stays a plain list of paths", "The CLI renders exactly the template on its stdin, and adds nothing", and the exit-1 rule for a lone reference to nothing in "A template that does not compile is misuse (exit 2), including a reference that resolves to nothing, save a lone reference under the CLI's --format until item 129". The README's examples and exit codes, the godoc examples in doc.go and CHANGELOG.md's entries move to the template spelling. Delete items 40 and 110, which this closes.

Split it into items for the CLI, struct tags and the library before starting.

163. Lift the CLI's --repeat cap, since the CLI streams each render, and give the builtins' count and decimal caps a technical reason in the README.

The README's Audience names a bulk fixture author writing millions of rows, and -n 5000000 is misuse today, so they loop. The decision "The repeat cap bounds renders, not bytes" covers nested repeats in data, not -n. The README's Functions section justifies the builtin caps by a fat-fingered hex(2000000000), a guess at a mistake under goal 5.7; the reason that holds is that one render may not allocate gigabytes. The goals audit of the narrowed goal 5.7 found it.

57. Rewrite CHANGELOG.md's [Unreleased] as what v0.1.0 holds.

Nothing has shipped, so "no longer paths", "where it used to fail" and "where it used to be an empty string" describe versions no reader can have installed.

153. Run the nine-seat comprehension panel and the scoring run again once items 148 and 151 have merged, and file what the panel names.

The decision "comprehension floor: every dimension and the overall at 7.0 or above" holds the scores this run is measured against.

164. Let a table's format or a cell bind a name, which lives in that format or cell and keeps one pick through the draw.

The maintainer ruled so on 2026-10-09: a name is a lexical closure, as the decision "A name lives in the category binding it, or in the repeat or choice item binding it, and is drawn on its first read" now states. Today table.go refuses {/sv_SE.person as p}{p.first} {p.last} in a cell with a table binds no name. A cell reads no name its table's format binds. Revise that decision's title and the README's Names list with it.

157. Show in the README's CLI section how PowerShell and cmd.exe pipe a template, one line per shell family.

Split from item 129. cmd.exe's echo keeps its quotes and a trailing space, so echo {/users} | fejkdata sends {/users} and stops naming the record.

167. Lower the reading cost of the files a chunk reads most before its first commit.

reading-cost on 2026-10-09: the last 5 chunks' median is 96842 new input tokens before their first commit, the 5 before them 79101. Read most over the last 5 (opens and searches): README.md 45, todo.md 24, AGENTS.md 23, cmd/fejkdata/main.go 23, CHANGELOG.md 21, pick.go 21, path.go 20, env.go 19, fejkdata.go 19, arm.go 18. The chunk shipping this item runs reading-cost --reset.

89. Fail New without WithSeed, naming the option, and seed the CLI from the system.

Goal 10.1 has the caller supply the seed, and today New without WithSeed seeds itself. This item ships in 0.1.0 beside item 77, so New breaks once before anyone depends on it. Mark WithSeed required in the Library section's options table. Its tests then stop swapping randomBytes, as fejkdata_test.go does today, which fails every New in the package while that test runs.

165. Let a table carry name with neither key nor parent, and list the rows a name matches by their line where it matches several.

The maintainer ruled so on 2026-10-09. Today bindOptions in internal/rows refuses such a table, since ambiguous, which reports a name matching several rows, lists those rows by key. Afterwards ambiguous lists them by line, the header being line 1, and ends with "make the names unique, or add a key column".

127. Give a Swedish street only postal codes whose delivery digit means street or rural delivery, dropping codes whose delivery digit is 9, or record why they stay.

docs/research/research-geo-se.md reads delivery digit 0 or 1 as boxes, 2–4 and 6–7 as street, 5 as rural, 8 as reply mail and 9 as competitions or temporary, with exceptions in big cities. street_delivery drops 0, 1 and 8 and keeps 9. The panel of 2026-10-05 found it; whether a shipped street carries a 9 code is unchecked.

110. Refuse an empty segment in a path Fake and FakeRecord take, as a reference does: sv_SE.person. reports path has an empty segment.

Today Fake("sv_SE.person.") reports no field "", while {/sv_SE.person.} reports path has an empty segment. grammar.CheckSegments is the check a reference, a sibling path and a step up .. run.

166. Let a key or name cell hold a bracket, a brace, a double quote or a pipe, so the table loads, its row draws at random, and only a selector cannot reach it.

The maintainer ruled so on 2026-10-09. Today checkSelectorCells in internal/rows refuses the whole table. Afterwards a path naming such a key fails with an error naming the character a selector cannot spell, and the README says a row whose name holds such a character is still selected by its key.

151. Load a caller's path and walk it in one Generator method, so no entry point walks the root before the shipped category the path names has loaded.

Fake and FakeRecord each call loadShippedAt before they walk, and its doc asks the next entry point to do the same. The greenfield architect of the 2026-10-07 panel on ad59967 named it the one corner a new senior would break without warning. A test passing WithDataPath would not catch it, because then New loads every category.

58. Ship prebuilt binaries, a container image, and packages for Homebrew, Scoop and the biggest Linux package managers, so the CLI needs no Go.

GoReleaser attaches the binaries to the release the tag workflow publishes, and builds deb and rpm packages, an Alpine APK and an AUR package beside Homebrew and Scoop. A checkout build prints devel for --version; the binaries carry the stamped tag. v0.1.0 ships first, so it can be tested before it is packaged.

113. Draw {iban(CC)} with its country's national check digits, and SE's with a real bank's id, so a validator checking more than mod 97 accepts it.

iban in internal/builtinfunc/checksum.go draws a random numeric BBAN and sets only the mod-97 digits. BE's last two digits are the first ten mod 97, NO carries a mod-11 account check digit, FI a Luhn digit, ES two control digits, and SE's three-digit bank id must be a real bank's (docs/research/research-sources-se.md). Goal 4 asks for the check the real system applies; the README's {iban(CC)} row promises only length and mod 97, and changes with it.

154. Add en_US.routing, an ABA routing number over the Fed's prefix ranges with its check digit drawn by {aba()}.

Needs item 34.

155. Add misc.isin and misc.cusip, built by their structure rules with their check digits drawn by {isin()} and {cusip()}.

Needs item 34: {luhn()} skips letters, so it draws a wrong ISIN check digit, and CUSIP's check digit is not Luhn.

26. Spell sv_SE.personnummer with the + Skatteverket uses from the year the holder turns 100, judged by a date the caller gives.

The format hard-codes -, and its earliest birthdate, 1930-01-01, makes the oldest draws invalid from 2030. A system holding Swedish personnummer often breaks on the +, so a fixture carrying one is a valuable test. Whether a number takes + depends on the date it is read, and the decision "No builtin reads the clock, so a date is bounded by days, never by an age" forbids a builtin from reading that date off the clock. This item revises it: once the caller gives the date, an age is a bound, and the CLI's default date makes output change with the day it runs unless the flag is given. Do the first step before the rest:

• Explore how a caller passes input data, such as the date a number is read on, to a render: in the template, as a plain option, or both. Make the library require the date, as item 89 makes it require the seed, and let the CLI default it to the system's when its flag is absent. Bench the spelling; --now reads like the clock. Shape the input so it can later narrow the draws to adults, children, 65 and over, or a mix, and so let a test ask for a centenarian; narrowing itself waits for its own item.
• Draw birthdates back past 100 years before the given date, so a + can appear. Read in 2026, the oldest shipped birthdate is 96 years old, so no draw carries a + until 2030. Skatteverket's test series reaches back to 1890, with birth numbers 980/981 before 1900. Draw no birthdate after the given date.
• Weight the ages by the territory's population, so the share of + numbers follows its demography: research-age-bands.md.
• Let a data author's own category spell the separator too, through a builtin or a function a data module provides (item 77), and update the README's personnummer recipe and its "a day in 1930–2025" count.
• Rewrite the README's --seed and WithSeed rows to goal 10's wording, and name the new required option in the changelog: New breaks a second time here, after item 89, as the maintainer accepted.
• Research: sv_SE.samordningsnummer also hard-codes - and draws from 1930. Check whether Lag (2022:1697) om samordningsnummer gives it the same +; folkbokföringslagen 18 § states the rule for personnummer only.

34. Add {isin()}, {cusip()}, {aba()} and {vin()}.

isin: Luhn over letters expanded to digits. aba: 3-7-1 weights. vin: position 9 over the whole; a sample taking the WMI, since the check sits mid-string.

81. Refuse at load every calc operand not proven numeric and every divisor not proven nonzero, in a string column too.

The decision "A constant zero divisor is a load error; in a string column a divisor that is not constant prints Inf" lets {calc(a/(b*c))} with b fixed at "0" write Inf into every row. An operand that is sometimes not a number prints NaN. Both work against goals 6.1 and 4. valueproof.go already proves a typed column's divisor nonzero. Once every operand is proven, neverNumeric and constantValue in calc.go go, and with them their reading of NaN and Inf as numbers, which proven.Literal refuses: calc reads text as a number one way.

91. Accept a path through a name as a calc operand, so {/misc.coordinate as c}{c}: {calc(c.lat * 60)} computes from the coordinate {c} prints.

A calc operand parses as a bare identifier, so {calc(c.lat * 60)} fails with unexpected ".lat * 60", and a second binding of /misc.coordinate.lat would draw another coordinate. Resolve the path through compileArm's leaves, as operandNodes does for a bare name.

36. Report every mistake a load finds in one error, as the decision "A load reports every mistake at once" states.

New and NewTemplate stop at the first, so data holding two mistakes takes two runs to fix. Split it into items before starting, one of them the shape a Go caller iterates and the CLI prints, and the order of an inline template's mistakes, which name no path; reword the README's "New refuses a mistake in the data" to every mistake.

88. Add a 12-digit YYYYMMDDNNNC form of sv_SE.personnummer and sv_SE.samordningsnummer, the form Skatteverket's testpersonnummer series and many systems store.

A system that stores the 12-digit form never meets the +, so it needs a fixture in that form.

41. Key every table by one key column, as the decision "A table selects by one key column, a code, never a free-form name" states.

geo.SE.municipality[Lund] and misc.territory[Sweden] select a row today. Steps:

• Have a selector that misses name the key of every row whose cell spells it, matched without case, else say the table selects by its key: misc.territory[Sweden] and misc.territory[se] name [SE], misc.protocol[tcp] its key, and misc.loglevel[Error] [err].
• Delete the name option and the load checks it carries, and have New refuse a table still carrying name, naming key.
• Key misc.loglevel on keyword, and geo.SE.locality on the integer data-import/geo-se.py assigns as the decision states, linking street and postal-code by it.
• Drop key from last-name and sv_SE.title, and re-pin testdata/shipped_shape.txt.
• Leave no selection by name in README.md, CHANGELOG.md, docs/ or --help.

52. Name the file a link error comes from beside its category path, sub.x (/d/a/sub/x.json): ….

With several --data-path layers the author has to work out which directory won, while a parse error on the same file names it.

117. List the fields of what a path has reached when its next segment names one that is not there: {/word as a}{a.zz} reports no field "zz"; word has w.

Today the refusal names only the missing field, so a data author fixing a typo opens the category to find the spelling. Item 92 covers the hyphenated calc operand only.

28. Accept a middle name, and draw a personnummer whose sex matches a sex selected through a named pick.

Today personnummer draws its own sex, so a name and a number agree only through the README Data section's template, which reads both through one bound sex.

24. Stop misc.territory[EH].tld rendering .eh, the one shipped TLD misc.tld does not hold.

ISO 3166 reserves it for Western Sahara and the root zone has never been delegated it, so no resolver answers for it.

92. Name the hyphenated field in a calc's refusal, and say to rename it: today {calc(postal-code * 2)} reports no field "postal".

A hyphen is always subtraction in a calc, and the shipped data has hyphenated fields (postal-code and street-number in geo/SE/address). The refusal names the first fragment, not the field the author meant.

53. Let a table column carry a datatype, so --format json writes "safe": true and --format sql a boolean.

Today only a JSON field takes one, so misc.httpmethod's booleans are typed in Go and text everywhere else. Typing a shipped column changes what json and sql write, so the capability is a minor and applying it to misc.httpmethod is a major.

44. Have misc.tld[se] select the row keyed .se, or have its miss name [.se].

The decision "misc.tld keys carry the leading dot, where other tables key on a bare code" leaves misc.tld[se] missing today.

54. Read the tag through git/ref/tags/{tag} in publish_release.py.

GitHub answers tags/{tag} with 404 whatever exists, so the burnt-version guard never fires and a release lands on a tag already pointing at another commit.

31. Rename misc.territory.country to sovereign.

It holds a code, and country collides with the misc.country path it replaced.

20. Weight sv_SE.sex and en_US.sex by bearers, as the README's Data section says they are.

Neither names a weight, so a bare sex draws evenly.

50. Reword prove's refusal of a typed column reading a row, {/region}.

Say the format is the table's own (region's format "{name}"), name the read to write, {/region.<column>} with its columns, and stop calling a one-column format, {code}, composed text.

17. Give every shipped category a column for each part its format composes, and one record shape across the national ids; re-pin the shape.

misc.uuid gains variant, for one.

29. Let a path go from a selected row into the template beside its family: geo.US.locality[1714000].address.

Require the path step to reach a sibling category.

42. Refuse a struct tag's datatype other than its Go type's before proving its values, as the README's Library section promises.

datatype: boolean over {int(1,2)} on an int field answers prints an integer, not a boolean.

22. Give url and email a path that draws only domains nobody can register, keeping the wide set as the default.

17 of the 40 distinct ones shipped today sit on .se, .nu, .io and .co, which anyone may register, and only RFC 2606's example.com, .net, .org, .test, .example, .invalid and .localhost provably reach nothing.

46. Report the same error every load for a table with two bad options.

readTableOptions in table.go returns on the first in Go's map order.

158. Drop a UTF-8 byte order mark that starts stdin, and say in the README how to stop PowerShell 5.1 sending Göteborg as G?teborg.

A file a Windows editor saves with a BOM prints an invisible U+FEFF first, and a JSON template with one is read as a format string. PowerShell 5.1 encodes what it pipes to a program by $OutputEncoding, ASCII by default. The maintainer chose 0.2.0 on 2026-10-07.

79. Beside a --data-path, load in New the user's categories, the shipped ones they override or read, and the shipped ones whose reads reach an overridden one; load the rest on first reach.

Needs item 77, which makes an override fail unless it says it replaces.

The decision "With only the shipped set, a category loads on the first call reaching it; beside a --data-path, every category loads in New" parses the whole shipped set on every --data-path run, about 45 ms today and seconds once items 61 and 78 land. Goal 6 needs only the user's categories, the shipped ones they override, the shipped ones they read, and the shipped ones whose reads reach an overridden category, so the index would carry each category's reads.

107. Move the template engine into internal/, leaving the root the public API and its options.

The engine returns column values and the root builds Record. Revises the decision "The template engine stays the root package until item 107; what reads no engine type, a table's rows included, sits in internal/", and, if the vocabulary moves, "The vocabulary sits below doc.go's package clause, not in the package doc".

168. Test the shared steps of data-import/ in the merge gate, starting with geo.fence.

Against "Most, if not all, code should have automated tests" in technical-principles.md: no Python under data-import/ has a test, and the gate, docker build ., runs Go alone. Today geo.fence is checked only by regenerating both countries' TSVs from the full downloads and diffing them. Item 61 adds a geo script per country, each calling fence.

161. Let a field whose name starts or ends with whitespace be bound to a name, or refuse such an identifier, so { x as p} means one thing.

grammar/identifier.go allows a field named x, and { x} reads it, but checkBind in format.go refuses every padded binding, so no spelling binds that field to a name (goal 4.1), and the refusal names one meaning only (goal 5.6). The goals audit of the narrowed goal 5.7 found it.

112. Check a calc's field operands where its template resolves, beside its name operands, once item 36 reports every mistake at once.

Needs item 36. checkCalcFields runs at compile and checkCalcNames in resolveTemplates, two passes over one rule. Moving the field check there before item 36 would change which of two mistakes in two category files a load reports, since every category compiles before any resolves.

108. Name item 26 in the decision "No builtin reads the clock, so a date is bounded by days, never by an age", as the item that ends its conflict with goal 4.

Item 26 revises the decision, but the decision does not point back to it.

169. Reword the decision "A parent row with no child row is a load error" to say what each geo import does with such a row: drop it, or exit where geo-se.py would lose a kommun or a län.

Its entry says "The import script drops or fills such rows". There are two geo imports, and geo-se.py exits when geo.fence drops a kommun or a län, while geo-us.py drops counties and states. Rewording a decision is the maintainer's call.

38. Compare calcParser.binary's operator as a rune.

byte(p.rs[p.pos]) reads U+012B ī as +, so {calc(a ī b)} compiles as a + b.

45. Name the node a selector follows in childNamed's refusal.

sv_SE.person[1].first answers 1 is not a table.

49. Report a CRLF rows file holding only its header as having no rows.

parseRows answers "line 2 is empty".

13. Place xlsx cells by their r reference in data-import/xlsx.py.

A sheet omitting an empty cell shifts every later column left.

39. Stop the columnKinds suggestion naming a field's own kind or a narrower one.

An int64 or float64 field unproven in range is told to become itself, and a uint64 one to become int64.

51. Spell a table one way across the errors that name it.

In internal/rows, Pins.PinRow names t.path and Pins.MustRow panics with t.segment, so one table is territory and misc.territory, and the short spelling names no file where two folders hold that name.

115. Spell a rows file's line one way in every error, naming the file.

Today a cell reads g.t.b, line 3 (containedNode.labelIn), a cell check t.tsv: line 3, b (compileCells) and a link t.tsv line 3 (rows.Table.Link). A reference cycle found from a table's format through a cell names no line at all: reference cycle: g.t -> format -> b -> b -> /h -> …, where the column-to-cell step in renderEdges repeats the column name.

14. Spell misc.creditcard's digit runs {digits(n)}.

A "repeat": 14 over {digits(1)} draws every 14-digit run with the odds {digits(14)} does. Both load; make the shipped data write the shorter one. Re-pin seeded output in its own commit.

11. Test that every geo tree holds the five table names and the address columns that port across countries.

Nothing checks it, and a new country breaks it silently.

40. Parse defaultTable's path with the library's grammar.

The CLI counts brackets of its own, so a change to the selector grammar desyncs the default --table silently.

86. Read both en_US.phone formats' area codes from one category, as their exchange reads en_US.phone-exchange.

Both phone formats carry the same 21-code area list, so an edit to one copy can miss the other.

23. Give every other shipped category that could reach something real a path that never does.

phone draws live PTS and NANP ranges — PTS's five fiction series are the Swedish inert set, sourced in research-sources-se.md, and the NANP one still wants a source — and bankgiro, plusgiro and routing draw live prefixes.

75. Run every README sh, go and text example as a test, and compare each "Renders" line to a seeded render.

readme_test.go loads and renders each json block, but runs no sh example (CLI, Records, Table, Linked tables), no go example (Library) and no text block of error text, and compares no "Renders e.g." output, so goal 12.2 is not met.

72. Fail the merge gate when test coverage falls below the last recorded figure.

technical-principles.md holds that test coverage should not decline. docker compose run --rm cover prints the figure, and neither the Dockerfile gate nor .github/workflows/test.yml checks it.

95. Hold a struct's columns and the field each fills in one slice.

structShape.fieldIndexes pairs with its record template's columns by index alone, against the technical principle "one owner per value".

116. Turn a row index into its rows file's line in one function.

Today containedNode's cell line in graph.go, table.compileCells and each site in internal/rows add the header line and the one-based count.

56. Build on a manual run of test.yml.

workflow_dispatch leaves github.event.before empty, so the diff compares HEAD with itself and skips docker build.

109. Indent every script under data-import/ with hard tabs, as AGENTS.md requires and release-tooling/ does.

Technical principle: indent with hard tabs. All 19 scripts indent with four spaces, so an edit there either keeps the wrong style or rewrites the whole file.

63. Pair a street with its exact postnummer.

Needs an application to Lantmäteriet; today a street goes to the nearest postal code centroid. It rewrites shipped rows, so it is a major once 1.0 is cut and a minor before that.

62. Add {btc()} and {eth()}.

They need sha256 and keccak for Base58Check and EIP-55.

59. Promise in Generator's godoc that its renders run one at a time.

A caller wanting parallel throughput then makes one generator per goroutine.

65. Hold every change AGENTS.md says owes a CHANGELOG.md entry to one in CI.

The check covers data and testdata/shipped_shape.txt alone, where AGENTS.md adds a flag, an exit code, an exported name, a fence, a builtin and the lowest Go.

66. Cut the README's Layout block to the lines that say what a file name cannot.

doc.go and cmd/fejkdata/ restate their names.

67. Cut AGENTS.md to the rules only it states, and explain every term its comprehension rule uses.

The gh rule opens by restating the decision "GitHub is canonical, and the module path names it", a second copy that drifts. The comprehension rule packs the gate, its exceptions, the round and the at-or-above-7.0 regime into one line, and uses "depth 1", "nine-seat", "four-seat" and "answers it in one run" without saying what they mean.

64. Give every entry in docs/decisions.md the goal it serves, its date, who made it and the premise it rests on.

Propose a goal for an entry that serves none.

68. Make gitea.larvit.se/larvit/fejkdata a pull mirror of GitHub.

Gitea converts a repository to a mirror only by re-creating it, so until that runs the copy there is a second owner of one history.

69. Announce v1.0.0 where a developer choosing a fake-data tool already reads, with a README first screen for someone deciding in a minute.

The human cuts v1.0.0 once the shipped data is in its record shape and one full minor has shipped with no breaking change, per the README's Versioning table; pairing a street with its exact postnummer rewrites shipped rows, so a minor with no breaking change follows it first.