“IEEE 754 […] Has the interesting and useful property that two's complement comparisons of the underlying bit pattern of any two IEEE 754 numbers will have the same result as comparing the numbers that are represented”

That means that, if you interpret the bits of a float/double as an int32/int64, increase that integer by one, and then interpret the bits of the result as a float/double, you get the smallest float/double that’s larger than what you started with (with exceptions for NaN, infinities, +/- zero, and, possibly, some categories I forget)

That can be useful if you want to iterate over all floats between 0.0 and 1.0, for example, but may not be that efficient on some modern hardware, where moving data from the “float side” of the CPU to the “integer side” is expensive)