The tokenizer seems to treat commands (and some other tokens) as expandable strings. Why is this? It makes misleading colorization in PSReadLine.

function crazy$function {echo test} # `$function` appears to be a variable, but is not

crazy$function # again, `$function` appears to be a variable that will expand, but it is not

Another one that occurs is if you start a command with a dash, the tokenizer marks it as a parameter, but it should mark it as a command.