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contributed by "archontophoenix", following in the grand tradition of
code by people whose actual names I don't know. References #2537, but it
doesn't close until some sensible hashcode is used by default. Review by
community.
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Unique's seeming victory is overruled by committee. It is "distinct",
not "unique", wherein lies the nub. No review.
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Striking while the iron is hot, renamed removeDuplicates to unique and
deprecated removeDuplicates. The debate between distinct and unique was
vigorous but unique won by a freckle. (Dark horse 'nub' was disqualified
for taking performance enhancers.) The only thing which might need
review is the choice of name, but review by odersky.
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Scala implementation of fancier hashCode algorithm. At the moment it
isn't used unless you supply -Yjenkins-hashCodes to scalac. Without the
flag, the supplied test case generates 12559 unique hashCodes among
90000 case class instances; with the flag it generates 89999.
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