Float.isNaN: use Number.isNaN instead of global isNaN

[cknitt]

As we already know that the input type is float, we can/should use Number.isNaN instead of the global isNaN.

See

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN

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commit: fa87b4b