Support float16 #1782

Job	Run time
docs	28s
check-cfg	33s
minimal	20s
msrv	6m 20s
quickchecking	26s
rustfmt-clippy	48s
test-book	21s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	2m 33s
test-expectations (ubuntu-latest)	1m 45s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	2m 27s
test-expectations (macos-latest)	4m 9s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	2m 31s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	2m 14s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	2m 38s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	2m 34s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	2m 32s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	2m 31s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	2m 31s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 31s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	2m 31s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 30s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 31s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 31s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 31s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 30s
test (ubuntu-latest, 9.0, 0, 0, 1)	1m 49s
test (macos-latest, 9.0, 0, 0, 0)	2m 11s
	59m 16s

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