Require every choice variant to carry a path, and list only what Fake accepts

README.md

@@ -141,7 +141,8 @@ av == bv // true
 ```
 
 `f.List()` returns the sorted paths the loaded data offers — the categories, their
-dotted fields and folder segments (what the CLI's `-list` prints).
+dotted fields and folder segments (what the CLI's `-list` prints). It is exactly the
+set `Fake` accepts.
 
 A `*Fakes` is **not** safe for concurrent use — create one per goroutine.
 
@@ -362,7 +363,10 @@ no tokens at all, use a bare string node (`"100 Main St"`), emitted verbatim.
 
 This yields e.g. `Anna Eriksson`, `Erik Berg`, or rarely `dr Astrid von Flemming`.
 Any field is reachable by dotted path — `Fake("person.last")` renders just a
-surname; choices along the path are resolved at random.
+surname; choices along the path are resolved at random. A path may continue
+*through* a choice only where every variant carries the rest of it (so
+`currency.symbol` works across all 16 currency variants), which keeps a path from
+rendering on one call and failing on the next.
 
 ### Performance