[issue39121] gzip header write OS field

[Serhiy Storchaka]

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

The OS field is used in determining end-of-line convention for text files. But since we do not set the FTEXT flag, all files are binary. RFC 1952

Why do you need to set this field?

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue39121>
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