[issue8404] Set operations don't work for dictionary views

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

I found the issue. The view types didn't have Py_TPFLAGS_CHECKTYPES set, so the types were using the old-style binary operators.

Here's a patch that fixes the issue. Please review.

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Added file: http://bugs.python.org/file16966/fix_dictviews_set_operations.diff

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