Answer stability round 1 and product-owner round 1: the Swedish address paragraph warns of a street under a neighbouring postort, the street row names the centre point, phone-exchange's rule gets its own sentence, and a level is a path prefix

CHANGELOG.md

@@ -101,7 +101,7 @@ replacement, and each removed path, column or flag.
   and carries the same three. `person.prefix` is null where a person has no title,
   where it used to be an empty string, so `--format sql` writes `NULL` and a `string`
   struct field reading it becomes `*string`.
-- `en_US.phone-exchange` draws the three digits after a US area code from the codes
+- `en_US.phone-exchange` draws the three digits after a US area code evenly from the codes
   NANPA may assign: `200` to `999`, except `211`, `311` … `911`, `555`, `950`, `958`,
   `959` and `976`. `en_US.phone` draws its `exchange` from it.
 - `ErrNoColumns` is exported, so a caller can tell the one record fence a path can

README.md

@@ -162,8 +162,7 @@ Each locale carries `address`, `color`, `company`, `date`, `email`, `first-name`
 `ip`, `last-name`, `person`, `phone`, `price`, `sentence`, `sex`, `time`, `url`,
 `username`, `version` and `word`, formatted per locale; `sv_SE` adds `personnummer`
 and `samordningsnummer`, `en_US` adds `ssn`, `itin` and `phone-exchange` (the three
-digits after the area code, drawn evenly from the codes NANPA may assign: `200` to `999`,
+digits after the area code). `misc` carries `car`, `coordinate`, `creditcard`
-except `211`, `311` … `911`, `555`, `950`, `958`, `959` and `976`). `misc` carries `car`, `coordinate`, `creditcard`
 (Luhn-valid), `currency` (ISO 4217), `datetime` (RFC 3339), `emoji`, `httpmethod`,
 `httpstatus`, `language` (ISO 639-1, with its 639-2/T code), `loglevel` (syslog
 severity), `mac`, `mimetype`, `objectid`, `port`, `protocol`, `territory` (ISO
@@ -174,6 +173,9 @@ carry sub-fields — `misc.currency.symbol`, `misc.territory.alpha2`,
 `timezone`, `tld` and `useragent` are [tables](#table), so
 `misc.territory[SE].capital` and `misc.currency[Euro].symbol` select a row; `car` and
 `useragent` carry no key or name, so they are drawn from rather than selected in.
+`en_US.phone` draws its exchange from `en_US.phone-exchange`, which draws evenly from the
+codes NANPA may assign: `200` to `999`, except `211`, `311` … `911`, `555`, `950`, `958`,
+`959` and `976`.
 
 Where a script under [`data-import/`](data-import) reads a source, the facts come from
 that source, and the script drops a row only by a rule it states; elsewhere a small hand-written
@@ -261,7 +263,9 @@ one has no use for, and `sv_SE.title` has no `parent`, so it is selected as
 A `geo` folder holds one tree per country under its alpha-2 code: five
 [linked tables](#linked-tables) named alike, and an `address` record binding one locality
 and drawing its street and postal code inside it. The locale's `address` prints that
-record, and each of its columns describes the address printed.
+record, and each of its columns describes the address printed. Do not expect a check that a
+Swedish street lies in its postort to pass: a street may sit under a neighbouring postort,
+as the `street` row below says.
 
 | Table | `geo.SE` | `geo.US` | Weight |
 |-------|----------|----------|--------|
@@ -269,7 +273,7 @@ record, and each of its columns describes the address printed.
 | `municipality` | kommun, by code or name | county, by FIPS code or name | population |
 | `locality` | postort, by name; [`geo-se.py`](data-import/geo-se.py)'s `localities` picks which ship | incorporated place of 25,000 people or more with a postal code of its own, by GEOID or name; Hawaii has none | tätort population, the kommun's where the postort names it, else 200; place population |
 | `postal-code` | postnummer with street delivery, by code | ZCTA, by code | one; address ranges |
-| `street` | gatunamn, the ten with most road segments per postort, each segment counted toward the postort of the nearest postal code, so a street near a border may sit under the neighbouring postort | street name, the ten with most address ranges per place | segments; address ranges |
+| `street` | gatunamn, the ten with most road segments per postort, each segment counted toward the shipped postort whose postal code's centre point is nearest | street name, the ten with most address ranges per place | segments; address ranges |
 
 `geo.SE.region[Skåne län].municipality` draws a kommun in Skåne,
 `geo.SE.locality[Lund].street` a street in Lund, and

data-import/geo-se.py

@@ -136,8 +136,8 @@ class Nearest:
 
 def street_delivery(name, codes):
     """The codes delivered to a street. Outside ONE_POSITION's cities, the digit after the postort's own prefix is 0 or 1
-    for boxes and 8 for reply mail; inside them, a second digit 0 marks boxes. The postort's own prefix is three digits
+    for boxes and 8 for reply mail, that prefix being three digits where one three-digit prefix starts at least half
-    where one three-digit prefix starts at least half its codes, else two.
+    the postort's codes, else two; inside them, a second digit 0 marks boxes.
     Per docs/research/research-geo-se.md, Postal codes → Structure."""
     if name in ONE_POSITION:
         return [c for c in codes if c[1] != "0"]

doc.go

@@ -29,7 +29,8 @@ package fejkdata
 //     `namedPick`, `pickFrame`.
 //   - memo — what a named pick keeps its draws in, the variant drawn at each level
 //     and the value each path read: `drawMemo`.
-//   - level — a node a read's path starts at, passes or lands on. `arm.levels` holds one pick
+//   - level — a prefix of a read's path, from where it starts to its leaf; a choice and the
+//     variant drawn from it, or a table and its row, share one. `arm.levels` holds one pick
 //     key per level, and a step's `pathStep.at` indexes it.
 //   - pick key — the key a memo keeps a level's draw under, the level's path of segments:
 //     `pickKey`, `levelKeys`. A read through a name keys from the node its binding starts at,

namefence.go

@@ -142,9 +142,9 @@ func refuseTwiceDrawn(addressed map[pickKey]string, read string, n node, key pic
 }
 
 // refuseTwiceDrawnIn is refuseTwiceDrawn over t's own reads of its fields; a reference or a read
-// through a name draws apart from the pick. It steps into each read whose level a read of the name
+// through a name draws apart from the pick. It steps into each read whose level a read of the
-// passes, at that read's key under key: beside {n.w.a}, it refuses {n} where n's format reads {w}
+// name lands on or passes, at that read's key under key: beside {n.w.a}, it refuses {n} where
-// and w's reads {a}-{a}, since "w" and "w.a" are addressed.
+// n's format reads {w} and w's reads {a}-{a}, since "w" and "w.a" are addressed.
 func refuseTwiceDrawnIn(addressed map[pickKey]string, read string, t *template, key pickKey) error {
 	reads := map[string]int{}
 	var into []arm