Float type support

[fabiospampinato]

The following seems to work for enforcing a float constrain on a number:

type Float<T extends number> =  `${T}` extends `${bigint}` ? never : T;

const onlyFloat = <T extends number> ( x: Float<T> ): void => {}

onlyFloat ( 123 ); // Error
onlyFloat ( 123.123 ); // OK

It's basically just Integer but with the results flipped.

[sindresorhus]

// @jonahsnider