The non-associativity isn't just signed zeros: regular floating point addition
and multiplication of positive numbers is not associative
from math import nextafter
x = nextafter(1.0, 2.0)
print((x+x)+1.0, x+(x+1.0))
x2 = nextafter(1.0, 0.0)
print((x*x2)*x2, x*(x2*x2))
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