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Go's remainder operator keeps the sign of the dividend, so -1%10 is -1 and never matches the positive cases that choose "st"/"nd"/"rd". Negative inputs therefore always got a "th" suffix (-1th, -21th, -23th). Select the suffix from the absolute value while still formatting the original signed number.
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Summary
Ordinalpicksst/nd/rd/thwithx % 10/x % 100. In Go the remainder keeps the sign of the dividend, so negatives never hit those cases (-1%10 == -1) and always got"th"(-1th,-21th,-23th).This change selects the suffix from the absolute value and still formats the original signed integer.
Test plan
TestOrdinalswith negative cases (-1st,-11th,-21st, …)go test ./...