unicode-org / icu4x / 15976723074

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Reject empty durations when parsing ISO8601 durations (#6718)

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This fixes a small bug where `P` was being returned as valid. It also
adds more test cases to the current invalid durations.

3 of 4 new or added lines in 2 files covered. (75.0%)

58818 of 81078 relevant lines covered (72.54%)

461637.79 hits per line