Support float16 #1790

Job	Run time
check-cfg	38s
minimal	25s
docs	27s
msrv	5m 44s
quickchecking	25s
rustfmt-clippy	40s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	3m 6s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	2m 25s
test-book	9s
test-expectations (ubuntu-latest)	1m 43s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	3m 32s
test-expectations (macos-latest)	1m 43s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	2m 31s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	3m 27s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	3m 20s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	3m 27s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	4m 10s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	3m 23s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	3m 14s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	2m 50s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	3m 27s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	3m 48s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	4m 37s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	4m 33s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	3m 39s
test (ubuntu-latest, 9.0, 0, 0, 1)	1m 46s
test (macos-latest, 9.0, 0, 0, 0)	2m 9s
	1h 11m 18s

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