This site describes solve-engine as it is on main: 2.43.0, which npm does not have yet. npm installs 2.40.0, so a page may show an answer that version does not give yet.
AsConverterMatch
type AsConverterMatch = "exact" | "folded" | "ambiguous" | "prefix" | undefined;Defined in: packages/engine/src/vm/AsConverterRegistry.ts:25
How an as target matches a registry: "exact" when a converter is
registered under that spelling, "folded" when only its lower-cased form
is and reading it so changes no prefix, "ambiguous" when the lower-cased
form belongs to two spellings (mw), "prefix" when the one spelling it
folds to has a prefix of another case (MV for mV), and undefined when
nothing is registered.