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Linear-time `PSet.plusAll` and `PSet.minusAll`

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Skimming the source code, it seems the `PSet` implementations don't optimize `plusAll` and `minusAll` beyond looping over `plus` and `minus`. However, the [Efficient sets - a balancing act](https://www.cambridge.org/core/services/aop-cambridge-core/content/view/0CAA1C189B4F7C15CE9B8C02D0D4B54E/S0956796800000885a.pdf/functional_pearls_efficient_setsa_balancing_act.pdf) paper that...

jackfirth