20 - the give-way emitters take the try prefix, and tryRule the narrower type

AGENTS.md

@@ -308,10 +308,10 @@ someone spells it or pins it.
   the whole point of.
 - A readable spelling tried ahead of a general one — a CommonMark block, the image, the pipe
   table, a pipe cell — gives way with `undefined` for every shape it cannot spell, and fails only
-  where the general form fails on the same node. Refusing there refuses a document the general
-  form spells, so a refusal the general form does not share belongs in the general form or
-  nowhere — save the nested list a tight spelling would swallow, whose refusal the
-  tight-versus-blank answer owns (`todo.md` 2b). A readable spelling that must spell its subtree
+  where the general form fails on the same node; it takes the `try` prefix, so both arms read at
+  the call site (20). Refusing there refuses a document the general form spells, so a refusal the
+  general form does not share belongs in the general form or nowhere — save the nested list a
+  tight spelling would swallow, whose refusal the tight-versus-blank answer owns (`todo.md` 2b). A readable spelling that must spell its subtree
   before it can give way — the list, whose thematic-break first line and blank lines exist only
   spelled — hands that one walk to the general form instead: giving way after the walk walks
   again at every level, doubling per level (4b).