docs: document float property (for v2.1.2) #34713

Job	Run time
setup	1m 52s
Shard (0) Module Integration Tests	10m 50s
Shard (0) HTTP Integration Tests	12m 12s
integration-tests-packages	13m 20s
Shard (0) Unit Tests	9m 0s
Shard (1) Module Integration Tests	9m 30s
Shard (1) Unit Tests	5m 8s
Shard (1) HTTP Integration Tests	8m 56s
unit-tests	1s
integration-tests-modules	1s
integration-tests-http	1s
	1h 10m 51s

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