Fix a render's fallback frame to its unnamed group, and draw a pick's references in draw groups of its own

README.md

@@ -711,15 +711,16 @@ row:
 Renders e.g. `🇳🇴 Norway: capital Oslo, calling code +47`. Everything under a name is drawn
 once, so `{n}` and `{n.path}` agree, a [transform](#transforms) of `n.path` reads the same
 value, and a field `n` renders twice prints the same text twice. A name is a pick of its own:
-`{t.name}` and `{/misc.territory.name}` beside it are two draws.
+`{t.name}` and `{/misc.territory.name}` beside it are two draws, as are two names bound to one
+category.
 
 A name is drawn on its first read, and lives in the category binding it: any field of the
 category reads it, and a record's columns read one pick. Each render of the category picks
 anew, and so does each bare reference to it. A name a `repeat` binds picks again on every
 iteration, and one bound outside the repeat keeps its pick on every line.
 
-Rejected at load: a name bound twice in one category, or both 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
+Rejected at load: a name bound twice outside any `repeat`, twice in one `repeat`, or both
+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, which every other item would leave unbound; a binding nothing reads; a path
 through a name that selects a row, which the reference selects instead; and a binding in a
 table's format or cell. A field, column, category or folder name may not contain ` as `.