New submission from hai shi <shihai1...@126.com>:

strlen(data) can not be replaced by Py_SIZE(value) in 
https://github.com/python/cpython/blob/master/Modules/_ctypes/cfield.c#L1297.

victor have give a great example about it in 
https://github.com/python/cpython/pull/18419

I create this bpo for two reasons:
1. This question info could be removed(some questions info will catch my 
attention)
2. Current tests should be enhanced(It can not help me found this backward 
incompatible:( ).

----------
components: Tests
messages: 361656
nosy: shihai1991
priority: normal
severity: normal
status: open
title: Adding a unit test of ctypes
type: enhancement
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39593>
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