not using float or not compare ==.
(or using abs($x-$y) < $epsilon as you already shown which is not the compare anyway)
I know my position is a bit strong, but using == on floats is going to make troubles, which depends on values, host, compiler, libc and so on. very hard to predict and replicate.
maybe a nice gift would be to have a warning?
Update: ops! i've replied to my node instead of moritz's 806454.
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