[swift-evolution] [Draft] Rename Sequence.elementsEqual

Kevin Nattinger swift at nattinger.net
Tue Oct 17 11:48:07 CDT 2017

> Because, in my analysis, the problem is that the method is incorrectly named. The problem affects all types that conform to Sequence and not just Set and Dictionary; elementsEqual is a distinct function from ==, and it must either continue to be distinct or cease to exist, but its name does nothing to clarify any distinction.

In my analysis, the problem is the method's implementation. As I see it, the only use for `elementsEqual` is as a replacement for `==` when two objects are different types (or not known to be the same)—equal elements, and IF the sequences have an order, in the same order. Could you provide an example where `elementsEqual` randomly returning either true or false depending on internal state alone is a legitimate and desirable result?

> Thanks,
> Jon
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