Make `union`, `difference`, and `intersect*` run linearly by sorting elements first#203

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JordanMartinez wants to merge 8 commits intopurescript:masterfrom

JordanMartinez:useOrdByDefault

Commits on Jan 1, 2021

Sort array in-place in unionBy, differenceBy, and intersectBy
JordanMartinez
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Commits on Jan 7, 2021

Clarify comment explaining combineIndex
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Commits on Jan 8, 2021

Use example for combineIndex that doesn't include duplicates
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differenceyBy: Only copy elements once; use indices everywhere else
JordanMartinez
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