Yeah, I know how popular the ARM chip is.
It seems like the existing [Asm Lexer](https://github.com/geany/geany/blob/master/scintilla/lexers/LexAsm.cxx) uses the wrong kind of comment characters, the wrong concept of what's a word/wordstart, and is probably wrong in other ways I have yet to discover as well. It doesn't appear to be configurable via the `[lexer_properties]` section at all.
So, I guess I'll need a new lexer.