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Various places in the spec allow for `<number> | <percentage>`, but this is either/or, and they are not allowed to be combined like dimensions and percentages are. (For example, `calc(12 + 50%)` is never valid.) User code generally doesn't need to care about this distinction, but it does now need to check if a calculation resolves to a number, or to a percentage, instead of a single call. The existing parse_number_percentage[_value]() methods have been kept for simplicity, but updated to check for number/percentage separately.