>
> (if [] true false)
>
> I'd hate to lose the ability to distinguish between an empty
> collection and nothing.
>
As a trade-off to allow nil-punning, you could stipulate the use of
coll? in the above situation:
(if (coll? []) true false) => true
This seems less burdensome - fewer cases where I'd need to do this vs
(if (seq s) ...
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