Keep a name's frame with the read entering its category, refuse a binding in a choice's item, and read a name as a transform operand

CHANGELOG.md

@@ -11,11 +11,12 @@ replacement, and each removed path, column or flag.
 - A name keeps one pick: `{/misc.territory as t}` binds one row of `misc.territory` to `t`
   and prints nothing, and `{t}`, `{t.capital}` and `{t.calling-code}` read that one row.
   A name lives in the category binding it, so every field and record column of the
-  category reads one pick, and a name a `repeat` binds picks again on every iteration.
-  Refused at `New`: a name bound twice in one category, or inside a `repeat` and outside
-  it; a name that is a field or an option; a binding of anything but a reference; a
-  binding nothing reads; a path through a name that selects a row; and a binding in a
-  table. A field, column, category or folder name may not contain ` as `.
+  category reads one pick, a transform reads it as `{lowercase(t.name)}`, and a name a
+  `repeat` binds picks again on every iteration. Refused at `New`: a name bound twice in
+  one category, or inside a `repeat` and outside it; a name that is a field or an option;
+  a binding of anything but a reference; a binding in a choice's item; a binding nothing
+  reads; a path through a name that selects a row; and a binding in a table. A field,
+  column, category or folder name may not contain ` as `.
 - First release: the CLI, the library and the shipped data set.
 - Table categories: a category JSON naming a `rows` TSV beside it, with the options
   `key`, `name`, `weight` and `parent`; a path selects a row by key or name,