avoid using Data::Dumper for Perl OBJECT refs #178
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Data::Dumper (at least as of 2.192, which is in the Perl git repo) doesn't support the new SVt_PVOBJ type, and generates a warning when it encounters it. It does actually return something, but the warning can be quite annoying.
This commit special cases reftypes of 'OBJECT', avoiding use of Data::Dumper altogether.
An alternative might be to filter out warnings for SVt_PVOBJ, but that seems an iffy approach.
I didn't add a test, as I'm not quite sure where it should go.