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feat: atomic_write helper (#157) - #159
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Closes #157
Adds
dol.atomic_write(path, data, *, fsync=False, perms=None, tmp_suffix=".tmp", exclusive=True): write to a sibling temp file, thenos.replace.datais bytes-like or an iterable of chunks. Purely additive (new leaf moduledol/atomic.py, one new export); no existing behaviour touched. Starter code:xdol.util.atomic_write,config2py.util.atomic_write_bytes.Tests:
dol/tests/test_atomic.py+ doctests; full suite 807 passed.Review verdict: (pending, filled below)