Revert #1563 and #1567 to prepare for patch release #588

Job	Run time
docs/nightly	22s
Pass MSRV values to other jobs	3s
miri	11m 6s
cross_test/s390x-unknown-linux-gnu/stable	7m 44s
cargo-careful	2m 9s
clippy/stable	21s
format/nightly	13s
nostd/thumbv6m-none-eabi/stable	21s
cross_test/i686-unknown-linux-gnu/stable	2m 0s
tests/1.64.0	3m 44s
tests/beta	2m 26s
tests/stable	2m 42s
blas-msrv	45s
tests/nightly	3m 16s
conclusion	3s
	37m 15s

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