[docs] [issue37846] declare that Text I/O use buffer inside

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

It's just an implementation detail.  Python implementation and C implementation behave slightly different.  But user program shouldn't rely on the detail.

Why do you think implementation details should be declared?
Who needs the information?

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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37846>
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