Your version doesn't work with the usage I gave initially, that's what :-)

I agree there are bugs in this, but they are bugs that were present initially. Because this happens to be a very heavily used, very mission-critical piece of code, that unfortunately has no existing unit tests, I'm loathe to make anything more than the absolute minimal change to get rid of this warning message. For that reason what I did was to look at the generated C code and ensured that the only change was to add the particular required check against undef (the SvOK(tmp) check) to avoid the warning in this case.

Addressing each of your points:

• This is incorrect. The SvROK check means that only references are accepted. I've verified that 123 and 'abc' are not accepted. The two that are references are accepted, and that is indeed a bug, albeit a preexisting one.
• Indeed, a preexisting bug
• Yes, that is what the current interface does and is expected for that usage.
• No, but it's what gets generated by the original XS code

Can you explain to me exactly the difference between T_OBJECT and T_PTROBJ? I can't find anywhere in the perl docs that explains the standard typemaps, but maybe I'm not looking in the right place.

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