reverseMethod

runtime method name -> named method name, owner-free — which is what lets a stack-trace frame demap without resolving its class. Unmapped names (constructors, library methods) pass through unchanged, and so do AMBIGUOUS ones: guessing one of them would be a lie in the one place that cannot check it.

DISPLAY ONLY. A caller that needs a name it can rely on goes forward instead, through mapMethodAll over the class hierarchy — see Signatures.runtimeNamesOf.