[sdiacom]

I'm glad it helped! Now that I'm actually looking at the different ways to manipulate strings in JavaScript and not going from memory, the traditional JavaScript "except when it doesn't" caveat applies.

It seems like _some_ string operations treat each surrogate (that's the fancy name for the half-characters) as its own character, while others (correctly) treat the surrogate pair as a single character.

This might explain how ensuring that the function name does not contain astral character would make it easier to use different string functions together without accidentally introducing bugs.