common: cope with i64::MIN in PartialOrd #251

Job	Run time
deny	3m 32s
coverage	2m 7s
clippy	22s
build (stable)	23s
build (beta)	22s
doc	18s
build (nightly-2023-04-01)	26s
examples (stable)	20s
formatting	57s
examples (beta)	19s
Rust 1.58.0 MSRV	1m 45s
examples (nightly-2023-04-01)	23s
Build for a no_std target (stable)	19s
Rust 1.59.0 MSRV	1m 46s
test (stable)	22s
test (beta)	24s
Build for a no_std target (beta)	23s
test (nightly-2023-04-01)	27s
udeps	4m 36s
Build for a no_std target (nightly-2023-04-01)	21s
	19m 52s

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