Maybe physical identity is too strong of a requirement for equality.  So 
another way to think about it is that it's 'hash-set', 'set', and '#{}' 
that are--you know--"broken", but that there's a fix, which is to always 
use 'sorted-set'.  (I'm assuming that calling 'seq' on any two sorted sets 
that are = always returns seqs that are =.)

(Don't take offense at the tone of my remarks.  I think we're all on the 
same side here.)

On Saturday, February 8, 2014 10:14:37 PM UTC-6, Mars0i wrote:
>
> Maybe another way to put it is that what is, uh, "broken" isn't 'map' or 
> 'seq', but '=', which is willing to tell you that two things (sets) are the 
> same when they're not!  We also have the non-broken predicate 'identical?', 
> however, that gets it right.  It's nice to also have a set-equal predicate, 
> which ignores differences in how sets are stored, and ... that's what '=' 
> is!  However, if we interpret '=' as implying that when the same function 
> is applied to things that are "equal" in its sense, then we are making a 
> mistake: '=' doesn't mean that.  According to this reasoning, nothing here 
> is broken, even from an extra-linguistic perspective.  '=' just shouldn't 
> be misunderstood.  (In a language with different design and style goals, it 
> might been preferable to define "=" to mean what Clojure means by 
> 'identical?', and use something else--perhaps "equivalent?"--for a 
> predicate analogous to Clojure's '='.)
>

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