[Python-Dev] Re: Keyword arguments with non-string names

I realized something that makes this even more tricky: dicts are mutable. So even if the dict contains only string keys at call time, it could theoretically be changed by the time that keywords are parsed. So for calling conventions passing dicts, I would leave it to the callee to sanity check the dict (this is the status quo). For the vectorcall/FASTCALL calling convention, the situation is a lot better: the call arguments are immutable and there are not many places where vectorcall calls are made with keywords. So we could check it on the caller side. I'll try to implement that. Jeroen.