apache / commons-numbers / 516

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travis-ci

Fix fraction hashCode

The sign must be incorporated into the hash as a fraction with the same
numerical value can have different representations:

-1/3 == 1/-3

Using the sign ensures that -1/3 and 1/3 have different hash codes. This
would not be true if the hash were constructed using only the absolute
values of numerator and denominator.

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