> Begin forwarded message:
>
> From: Kevin Nattinger <sw...@nattinger.net>
> Subject: Re: [swift-evolution] [Draft] Rename Sequence.elementsEqual
> Date: October 14, 2017 at 12:52:34 AM PDT
> To: Xiaodi Wu <xiaodi...@gmail.com>
>
>> […]
>> Regardless of the specific type of ordering, lexicographicallyEquals says to
>> me that the objects should be sorted into lexicographical order and
>> compared. Precisely the opposite of the proposal.
>>
>> That is an interesting interpretation. I suppose anyone has the right to
>> interpret anything in any way they please, but this seems a uniquely
>> idiosyncratic interpretation. The total ordering is over the set of all
>> sequences, and the comparison is between two sequences--note that the
>> function name uses the singular ("equals") and makes no reference to the
>> lexicography or ordering of elements. Likewise, dictionaries don't sort
>> "hello" and "world" by comparing "ehllo" and "dlorw”.
>
> Others have expressed the same interpretation as well. It’s most certainly
> not “uniquely idiosyncratic.”
> As for the rest of this, perhaps it’s the late hour, but I don’t see your
> point or the relevance to my argument. I didn’t say anything about sorting
> individual elements, just that elements would be reordered so that both
> sequences would be in lexicographical order. Comparing unordered collections
> according to their (nonexistent) order is nonsensical, so the only useful way
> to compare them would be to impose an external order.
>
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