[issue45452] Support crash tolerance feature for gdbm module

[Dong-hee Na]

Dong-hee Na <donghee.na at python.org> added the comment:

> How would it be used from Python? What are scenarios?

I am preparing PoC, I will share you once done.

>From gdbm 1.21, gdbm provides 2 kinds of format. (Standard format / Extended format.)
To create a gdm format with the extended option, GDBM_NUMSYNC flag needs to be supported.
Without this, there is no way to create a database file with extension option from Python module.

I am thinking about the following usage.

import dbm.gnu as dbm
db = dbm.open('x.db', 'nx')

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<https://bugs.python.org/issue45452>
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