Add support for BigFloat #1415

Job	Run time
test (Core, 1, ubuntu-latest)	26m 58s
test (Core, 1, macos-latest)	10m 32s
test (Core, 1, windows-latest)	37m 58s
test (Downstream, 1, ubuntu-latest)	9m 10s
test (Downstream, 1, macos-latest)	5m 44s
test (Downstream, 1, windows-latest)	12m 47s
test (Misc, 1, ubuntu-latest)	18m 59s
test (Misc, 1, macos-latest)	8m 36s
test (Misc, 1, windows-latest)	22m 21s
test (Wrappers, 1, ubuntu-latest)	10m 54s
test (Wrappers, 1, macos-latest)	17m 53s
test (Wrappers, 1, windows-latest)	20m 3s
	3h 21m 55s

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