Detects whether Length is a safe size to materialize as a tuple at the type level. Only matches
non-negative integer literals 0–99, whose stringification is exactly one or two ASCII digits.
Anything else — sizes ≥ 100, negatives, non-integers, scientific notation, or a non-literal
number — fails to match, because _TupleOf either exceeds TS's recursion limit or never
terminates for those inputs.
Detects whether
Lengthis a safe size to materialize as a tuple at the type level. Only matches non-negative integer literals 0–99, whose stringification is exactly one or two ASCII digits. Anything else — sizes ≥ 100, negatives, non-integers, scientific notation, or a non-literalnumber— fails to match, because_TupleOfeither exceeds TS's recursion limit or never terminates for those inputs.