common: cope with i64::MIN in PartialOrd #246

Job	Run time
build (stable)	18s
coverage	15s
build (beta)	24s
deny	3m 37s
clippy	23s
build (nightly-2023-04-01)	26s
doc	12s
examples (stable)	22s
formatting	59s
examples (beta)	21s
Rust 1.58.0 MSRV	2m 8s
Build for a no_std target (stable)	20s
Rust 1.59.0 MSRV	1m 19s
examples (nightly-2023-04-01)	23s
test (stable)	23s
Build for a no_std target (beta)	45s
test (beta)	21s
Build for a no_std target (nightly-2023-04-01)	22s
udeps	4m 28s
test (nightly-2023-04-01)	26s
	18m 12s

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