>
> Other than that, there is just the general loss of nil-punning. This
> was the theoretical problem that kept me from making this tradeoff
> earlier. I'm very much interesting in hearing from those for whom the
> lazy branch represents a real problem due to loss of nil punning.
>
To preserve nil-punning, could the 'if' special form be changed to
internally perform the equivalent of the seq call when presented with
a sequence? Since more is guaranteed to never return nil, in the
context of an 'if', a seq call would always be appropriate. I suppose
there's a performance hit for checking whether the argument is a
Sequence before calling seq on it, but instanceof is supposed to be
very fast with hotspot.
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