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Owns precedence and provenance and nothing else, and never reads the
filesystem, so it is as testable as the language table.
resolve returns the value AND its source, because a setting that silently
comes from a file the user forgot about is worse than no setting at all --
config --show can then say where each effective value came from.
overlay accumulates rather than last-wins: a user has more than one.
An unknown key is reported, never fatal. A config written for a newer
colitur must still work on an older one, but silently dropping a line the
user wrote is how a typo becomes invisible.
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