[issue35504] `del OSError().characters_written` raises `SystemError`

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

> Why is it using -1 instead of NULL as the "not-set-indicator"?

Because the field of the C structure has integer type, and it can not be the NULL pointer.

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<https://bugs.python.org/issue35504>
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