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In the algorithm to calculate ratios in section 2.4.4.4, step 7 is erroneous The correct statement should be 7. If the string contains any other characters in the range U+0030 DIGIT ZERO to U+0039 DIGIT NINE, but denominator was [missing "not"]given a value in the step 6, return nothing and abort these steps.
My bad. Didnt read the full algorithm before logging this bug