mwg API
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    Interface PlaceholderDiff

    interface PlaceholderDiff {
        changed: { base: string; target: string; token: string }[];
        extra: string[];
        missing: string[];
    }
    Index
    changed: { base: string; target: string; token: string }[]

    same token, different conversion/spec/debug shape on each side

    extra: string[]

    tokens the target supplies that the base never needs

    missing: string[]

    tokens the base message needs that the target never supplies