- tui_gateway _load_cfg_raw: only FileNotFoundError means "no config".
config_version_or_none folded every stat error into None, so after a
cached absent config a transient EACCES matched the cached {} and the
next config.set could save it over the now-existing file. Any other
stat error is a FailedConfigRead again, which _save_cfg refuses.
- ConfigBackend.read_user_doc replaces read_user_layer/UserLayer: no
caller used the version it stat'ed on every uncached read; cached
loaders already ask config_version first.
- Reader lint scopes follow Python: a self.<attr> bound in one method is
seen by every method of the class, and a comprehension's target no
longer leaks into the enclosing function. The class rule found
pm/publication.py's compare-and-swap re-read of self.path, now marked
like its twin in __init__.
Teknium
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