From 143311270ce30e20ecd3fa7fc684669e3ea60e4c Mon Sep 17 00:00:00 2001
From: Lilleman auf Larv <lilleman@larvit.se>
Date: Mon, 12 Oct 2026 17:58:16 +0200
Subject: [PATCH] Answer product-owner round 1: the release notes link the
 tagged README, say how to install and pin, name 64-bit targets, List and
 IsTemplate, the README says a nullable column needs a pointer, and item 89
 names the changelog lines it changes

---
 CHANGELOG.md | 114 ++++++++++++++++++++++++++++-----------------------
 README.md    |   4 +-
 todo.md      |   2 +-
 3 files changed, 66 insertions(+), 54 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22bd871..3fad7cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,62 +7,74 @@ replacement, and each removed path, column or flag.
 ## [Unreleased]
 
 The first release: a Go library and a CLI that render locale-aware fake data from JSON
-templates, and the data they ship with. The [README](README.md) documents each part.
+templates, and the data they ship with. The
+[README](https://github.com/larvit/fejkdata/blob/v0.1.0/README.md) documents each part.
+Install the CLI with `go install github.com/larvit/fejkdata/cmd/fejkdata@v0.1.0`, or the
+library with `go get github.com/larvit/fejkdata@v0.1.0`. Before 1.0.0 a minor may break,
+and any release may change what a seed draws, so pin one exact version
+([Versioning](https://github.com/larvit/fejkdata/blob/v0.1.0/README.md#versioning)).
 
 ### Added
 
-- The CLI, `fejkdata`, renders exactly the template on its stdin and adds nothing:
-  `echo '{/sv_SE.person} hihi' | fejkdata` prints `Sara Eriksson hihi`. `--seed` makes a
-  run reproducible, `-n` repeats it, `--list` prints every path, and `--data-path` layers
-  a directory of your own data over the shipped set, or alone with `--no-shipped-data`.
-  `--format json|ndjson|csv|sql` writes a record's columns, one record per row. It exits
-  `0` on success, `1` on a runtime error such as data that fails to load, and `2` on
-  misuse.
-- The library, `github.com/larvit/fejkdata`, for Go 1.22 or later. `New` loads the
-  modules `WithDataFS` names and the folders `WithDataPath` names, and fails, naming
-  `WithDataFS`, where neither is given; `WithSeed` makes its draws reproducible. `Fake`
-  renders a path, `FakeTemplate` and `NewTemplate` a template, `FakeRecord`,
-  `FakeRecordTemplate` and `NewRecordTemplate` a record, whose columns `JSON`,
-  `CSVHeader`, `CSVLine` and `SQLInsert` write as the CLI does, and `FakeStruct` fills a
-  struct's `fake:"…"` tagged fields. Data that fails to load gives an error matching
-  `ErrLoad`, and a record with no fields one matching `ErrNoColumns`.
-- Package `github.com/larvit/fejkdata/cli` is the `fejkdata` command: `cli.Main(modules...)`
-  runs it over the modules given, so `cli.Main(append(data.Modules(), mydata)...)` builds a
-  CLI carrying your own data. That CLI names itself by the file it runs from, and its
-  `--version` prints its own module's version before fejkdata's.
-- The template language ([Data format](README.md#data-format)). A node is a string, a
-  choice, a template, a table, a number or a boolean. A format string's `{…}` tokens read
-  sibling fields, references from the data root or the file's folder
-  (`{/sv_SE.person.last}`, `{.x}`, `{..x}`), builtins and names. Every `{…}` draws
-  afresh, and a name is the one way to keep a pick: `{/sv_SE.person as p}{p.first}
-  {p.last}` is one person. The builtins draw check digits (`luhn`, `mod11`, `ean`),
-  samples (`digits`, `int`, `float`, `uuid`, `ulid`, `iban`, `date`, `time` and more), a
-  counter (`seq`), arithmetic (`calc`) and transforms (`lowercase`, `uppercase`,
-  `ascii`). `New` refuses data that breaks the grammar, could mean two things or cannot
-  render a valid value.
-- Records ([Records](README.md#records)): a template seen as columns. A column is a
-  string unless it declares a `datatype`, `integer`, `number` or `boolean`, and a `null`
-  item draws it as null.
-- Tables ([Table](README.md#table)): a category naming a `rows` TSV beside it, with the
-  options `key`, `name`, `weight` and `parent`. A path selects a row by key or name,
-  `misc.territory[SE]`, descends to a linked table, `geo.SE.locality[Lund].street`, and
-  steps up to the parent row, `{/misc.timezone[Europe/Oslo]..territory.name}`.
-- Data sources ([Data](README.md#data)): a directory is a namespace, and each JSON file
-  in it a category. A `.fejkdata.json` manifest at a source's root may carry a
-  `namespace`, the dot path the source mounts under, and an `index`, with which each
-  category loads on the first call reaching it.
+- The CLI, `fejkdata`, renders exactly the template on its stdin and adds nothing: `echo
+  '{/sv_SE.person} hihi' | fejkdata` prints e.g. `Sara Eriksson hihi`. `--seed` makes a
+  run reproducible for one version and data, `-n` repeats it, `--list` prints every
+  path, and `--data-path` layers a directory of your own data over the shipped set, or
+  alone with `--no-shipped-data`. `--format json|ndjson|csv|sql` writes a record's
+  columns, one record per row. It exits `0` on success, `1` on a runtime error such as
+  data that fails to load, and `2` on misuse.
+- The library, `github.com/larvit/fejkdata`, for Go 1.22 or later on a 64-bit target.
+  `New` loads the modules `WithDataFS` names and the folders `WithDataPath` names, and
+  fails, naming `WithDataFS`, where neither is given; `WithSeed` makes its draws
+  reproducible for one version and data. `Fake` renders a path, `FakeTemplate` and
+  `NewTemplate` a template, `FakeRecord`, `FakeRecordTemplate` and `NewRecordTemplate` a
+  record, whose columns `JSON`, `CSVHeader`, `CSVLine` and `SQLInsert` write as the CLI
+  does, and `FakeStruct` fills a struct's `fake:"…"` tagged fields. `List` gives every
+  path `Fake` renders, and `IsTemplate` tells an inline template from a path. Data that
+  fails to load gives an error matching `ErrLoad`, and a record with no fields one
+  matching `ErrNoColumns`.
+- Package `github.com/larvit/fejkdata/cli` is the `fejkdata` command:
+  `cli.Main(modules...)` runs it over the modules given, so
+  `cli.Main(append(data.Modules(), mydata)...)` builds a CLI carrying your own data.
+  That CLI names itself by the file it runs from, and its `--version` prints its own
+  module's version before fejkdata's.
+- The template language ([Data
+  format](https://github.com/larvit/fejkdata/blob/v0.1.0/README.md#data-format)). A node
+  is a string, a choice, a template, a table, a number or a boolean. A format string's
+  `{…}` tokens read sibling fields, references from the data root, the file's folder or
+  the folder above (`{/sv_SE.person.last}`, `{.x}`, `{..x}`), builtins and names. Every
+  `{…}` draws afresh, and a name is the one way to keep a pick: `{/sv_SE.person as
+  p}{p.first} {p.last}` is one person. The builtins draw check digits (`luhn`, `mod11`,
+  `ean`), samples (`digits`, `int`, `float`, `uuid`, `ulid`, `iban`, `date`, `time` and
+  more), a counter (`seq`), arithmetic (`calc`) and transforms (`lowercase`,
+  `uppercase`, `ascii`). `New` refuses data that breaks the grammar, could mean two
+  things or cannot render a valid value.
+- Records ([Records](https://github.com/larvit/fejkdata/blob/v0.1.0/README.md#records)):
+  a template seen as columns. A column is a string unless it declares a `datatype`,
+  `integer`, `number` or `boolean`, and a `null` item draws it as null.
+- Tables ([Table](https://github.com/larvit/fejkdata/blob/v0.1.0/README.md#table)): a
+  category naming a `rows` TSV beside it, with the options `key`, `name`, `weight` and
+  `parent`. A path selects a row by key or name, `misc.territory[SE]`, descends to a
+  linked table, `geo.SE.locality[Lund].street`, and steps up to the parent row,
+  `{/misc.timezone[Europe/Oslo]..territory.name}`.
+- Data sources ([Data](https://github.com/larvit/fejkdata/blob/v0.1.0/README.md#data)):
+  a directory is a namespace, and each JSON file in it a category. A `.fejkdata.json`
+  manifest at a source's root may carry a `namespace`, the dot path the source mounts
+  under, and an `index`, with which each category loads on the first call reaching it.
 - The shipped data, in Go packages that each export `FS` and `Modules()`:
   `github.com/larvit/fejkdata/data/en_US` (package `enus`), `…/sv_SE` (`svse`),
   `…/misc`, `…/geo/SE` (`geose`) and `…/geo/US` (`geous`). `data.Modules()`, from
   `github.com/larvit/fejkdata/data`, lists every one, and the CLI carries them all.
-  [`DATA-LICENSES.md`](DATA-LICENSES.md) names each source.
+  [`DATA-LICENSES.md`](https://github.com/larvit/fejkdata/blob/v0.1.0/DATA-LICENSES.md)
+  names each source.
   - `sv_SE` and `en_US`: an `address`, a `person` and more per locale. `sex`,
     `first-name` and `last-name` are tables weighted by bearers, from SCB, the SSA and
     the Census Bureau. A person's first name and sex agree, and so does an `en_US`
-    person's title; `person.prefix` is null where a person has no title. `sv_SE.personnummer` and
-    `sv_SE.samordningsnummer` draw Skatteverket's test series. `en_US.ssn` and
-    `en_US.itin` draw the ranges the SSA and the IRS assign, with the columns `area`,
-    `group` and `serial`, and `en_US.phone` draws an exchange NANPA may assign.
+    person's title; `person.prefix` is null where a person has no title.
+    `sv_SE.personnummer` and `sv_SE.samordningsnummer` draw Skatteverket's test series.
+    `en_US.ssn` and `en_US.itin` draw the ranges the SSA and the IRS assign, with the
+    columns `area`, `group` and `serial`, and `en_US.phone` draws an exchange NANPA may
+    assign.
   - `misc`: IANA's registries of HTTP methods, protocols, ports and root-zone TLDs, the
     HTTP status codes, ISO 3166-1 territories, ISO 4217 currencies with their CLDR
     symbols, ISO 639 languages, the syslog severities, mime-db's media types, tzdb's
@@ -73,8 +85,8 @@ templates, and the data they ship with. The [README](README.md) documents each p
     `locality`, `postal-code` and `street`, weighted by population and address counts
     and built from SCB, GeoNames, Trafikverket NVDB, the US Census Bureau and Wikidata,
     and an `address` record drawing a street and postal code inside one locality, which
-    `sv_SE.address` and `en_US.address` print. Every Swedish postort the import can place
-    ships with all its streets. Of the US incorporated places that hold most of some
-    postal code's land, every state capital but Honolulu, every place of 100,000 or more
-    and a population-weighted tenth of the rest ship, each with a quarter of its streets,
-    at least ten.
+    `sv_SE.address` and `en_US.address` print. Every Swedish postort the import can
+    place ships with all its streets. Of the US incorporated places that hold most of
+    some postal code's land, every state capital but Honolulu, every place of 100,000 or
+    more and a population-weighted tenth of them ship, each with a quarter of its
+    streets, at least ten.
diff --git a/README.md b/README.md
index 304c9d9..2417548 100644
--- a/README.md
+++ b/README.md
@@ -331,7 +331,7 @@ Swedish region but `abbr` on a US one.
 ## Library
 
 ```sh
-go get github.com/larvit/fejkdata   # Go 1.22+
+go get github.com/larvit/fejkdata   # Go 1.22+, 64-bit targets
 ```
 
 ```go
@@ -416,7 +416,7 @@ type Address struct {
 a column of one record, its tag a path or an inline template — told apart by
 `IsTemplate` — and its Go type the column's
 [datatype](#datatype): a string, bool, integer or float kind, or a pointer to one,
-which a [`null`](#null) item leaves nil. An integer stays within int64 whatever its
+which a column that can be null requires and a [`null`](#null) item leaves nil. An integer stays within int64 whatever its
 kind, and a value the kind cannot hold, such as `{int(0,300)}` in a `uint8`, is refused
 naming a kind that holds it. The tags are a record's columns, so they share its
 [names](#names): `First` tagged `{/sv_SE.person as p}{p.first}` and `Sex` tagged `{p.sex}`
diff --git a/todo.md b/todo.md
index 7995945..bbce014 100644
--- a/todo.md
+++ b/todo.md
@@ -217,7 +217,7 @@
 
 ### 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. It ships in 0.1.0, which already makes `New` refuse a call that names no data, so `New` breaks once, before anyone depends on it. Mark `WithSeed` required in the Library section's options table. `New`'s tests then stop swapping `randomBytes`. `fejkdata_test.go` swaps it today, and while that test runs, every `New` in the package fails.
+Goal 10.1 has the caller supply the seed, and today `New` without `WithSeed` seeds itself. It ships in 0.1.0, which already makes `New` refuse a call that names no data, so `New` breaks once, before anyone depends on it. Mark `WithSeed` required in the Library section's options table. `New`'s tests then stop swapping `randomBytes`. `fejkdata_test.go` swaps it today, and while that test runs, every `New` in the package fails. Rewrite the changelog's library line to say `New` fails naming `WithSeed` where none is given, and its CLI line to say the CLI seeds from the system without `--seed`.
 
 ### 58. Ship prebuilt binaries, a container image, and packages for Homebrew, Scoop and the biggest Linux package managers, so the CLI needs no Go.