How does Unity compare two floats for inequality?

Question

Unity

I compare heights from two vectors3 for the fact of inequality. what will happen to the comparison if one of the heights loses accuracy?

Answer 1

instead of comparing the height values, compare the modulus of their difference with the error of interest, for example:
если модуль(a - b) < 0.0005 -> a равно b

Answer 2

Vectors are usually subtracted from each other and the sqrMagnitude of the resulting vector is compared with the epsilon, also sometimes magnitude is taken , which is more expensive in calculations, but sometimes gives more accurate results.