[issue39593] ctypes s_set() uses strlen() and so truncates string at null character

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

I guess the `xx_get()` and `xx_set()` function's process logic have relation with ffi's type, after I checked some `xx_get()` and `xx_set()`'s process logic.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39593>
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