To fix the latter tangential issue, I'd like to propose that we simply return the first character of the output buffer, if the return value of ToUnicodeEx is >1. What do you think? (I'd open a seperate PR for this.)

That sounds reasonable based on the analysis above.

Originally posted by @miniksa in #3117 (comment)

This represents fixing the issue described in #3117 where other forms of multiple copies can occur based on the responses from ToUnicodeEx.