ts-type-forge
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    StructuralPrefixLength: UintRangeInclusive<0, StructuralPrefixCap>

    Union of the length values (0 | 1 | ... | 10) at or below StructuralPrefixCap — i.e. the lengths for which structural tuple expansion is considered cheap enough. Exported so that downstream libraries can use the same boundary as a type-parameter constraint (e.g. runtime validators that only encode a structural tuple type for lengths in this range and fall back to readonly Elm[] otherwise).