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prefix +!

🌌float.prefix +!

preconditions for basic operations: true if the operation's result is
representable for the given values. For IEEE_754, all operations are
defined for all values.

redefines numeric.prefix +!:
preconditions for basic operations: true if the operation's result is
representable for the given values

This does not check if the operation is defined (i.e, it
returns true for '3/!0' or '0**!0'.