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@zelphirkaltstahl It works with standard IEEE 754 floats, yes.

The problem with doing (a - b) is that you might get 1000.0 or you might get 0.001. Depending on the magnitude of a and b, both might represent an expected rounding error in the least significant bits of a float.

A codebase I'm working on had arbitrary epsilon constants: 1e-6 for floats and 5e-15 for doubles. Such absolute thresholds are only reasonable for values in a narrow range (for example 0.1..10.0).