[issue45452] Support crash tolerance feature for gdbm module

[Dong-hee Na]

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

> And what's next?

I may introduce following API which only available to use extension format.
(I am PoC with this)

> dbm.gdbm_failure_atomic('snapshot_path0', 'snapshot_path1')


About gdbm_latest_snapshot(), I am still curious that Python module should provide this API so I am still communicating with original authors about this.

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