Build

Fix sub-second negative Duration serialization. #1718

Job	Run time
Test (Ubuntu, MSRV)	3m 36s
Type checking (MSRV, no_std)	3m 40s
Type-check benchmarks	25s
Test (Windows, MSRV)	4m 31s
Test (miri)	14m 3s
Type checking (MSRV, std_no_offset)	5m 15s
Test (MacOS, MSRV)	3m 51s
Type checking (MSRV, std_with_offset)	4m 9s
Test (Ubuntu, stable)	1m 5s
Clippy	57s
Type checking (stable, no_std)	54s
Cross-build	1m 17s
Test (Windows, stable)	2m 21s
Type checking (stable, std_no_offset)	2m 26s
Test (MacOS, stable)	31s
Documentation	22s
Type checking (stable, std_with_offset)	1m 29s
Formatting	10s
Coverage	31s
Publish docs	0s
	51m 33s

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