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    Variable SHADOW_UNIFORM_SPARE_BYTESConst

    SHADOW_UNIFORM_SPARE_BYTES: number

    The stride bytes still spare after the widening — the "rides the spare bytes" argument above, as a number a test can pin: if a later member ever drives this negative, the widened block no longer fits the landed LIGHT_UNIFORM_STRIDE_BYTES and the argument (not just a bind-time validation error) is what fails.