mwg API
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    Interface CatalogKeyDiff

    the keys two catalogs disagree on - what a translation catalog missing a key, or one abandoned key nobody removed, looks like structurally.

    interface CatalogKeyDiff {
        extra: readonly string[];
        missing: readonly string[];
    }
    Index
    extra: readonly string[]

    in other but not reference - a stale or misspelled key

    missing: readonly string[]

    in reference but not other - an untranslated key