Add tests for `(Partial)Ord` impls (#210) #431

Job	Run time
clippy	20s
careful	1m 0s
miri (s390x-unknown-linux-gnu)	1m 8s
miri (x86_64-unknown-linux-gnu)	53s
rustfmt	8s
coverage	19s
doc	14s
build (1.85.0, thumbv7em-none-eabi)	1m 23s
test (1.85.0)	53s
test (stable)	46s
build (1.85.0, armv7a-none-eabi)	1m 25s
build (stable, wasm32-unknown-unknown)	1m 7s
build (stable, thumbv7em-none-eabi)	1m 16s
build (1.85.0, wasm32-unknown-unknown)	1m 20s
build (stable, armv7a-none-eabi)	1m 7s
	13m 19s

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