Demangle Function

[Joe_Groff]

Moreso than performance, in a crash situation you may want to avoid memory allocation, as @IanPartridge notes:

Crash backtraces

This might be useful in a crash scenario where you want to avoid allocating memory. A pre-allocated buffer could be passed in.

So having a low-level form that reads and writes out of raw buffers would be useful, alongside the high-level String -> String interface.