merged branch pierrejoye/master (PR #527)

Commits
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115edf2 - fix property access when the instance implements Iterator or similar cases, by using get_object_vars instead, thx Arnaud Leblanc for the hint.

Discussion
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Fix props detection for instances implementing Iterator or similar cases

Fix property access when the instance implements Iterator or similar cases, by using get_object_vars instead, thx Arnaud Leblanc for the hint.