[issue16575] ctypes: unions as arguments

[Vinay Sajip]

Change by Vinay Sajip <vinay_sajip at yahoo.co.uk>:


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pull_requests: +17378
pull_request: https://github.com/python/cpython/pull/17970

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue16575>
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