[issue16575] ctypes: unions as arguments

[Vinay Sajip]

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


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keywords: +patch
pull_requests: +15485
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/15839

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<https://bugs.python.org/issue16575>
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