On 1 July 2012 15:04, Vinzent <ru.vinz...@gmail.com> wrote:
> Extend on nil, IIndexed and default (I realize that
> it's currently impossible in cljs).

Actually it is possible and it is how things were originally
implemented. The move to the current implementation happened as part
of an effort to make things faster. There are also some semantic
considerations involved, see below. In any case, user code shouldn't
need to worry about this.

I also wanted to note that whether it makes sense for IIndexed in
particular to be automagically implemented for all ISeq
implementations depends on whether it means "collection type which can
usefully be thought of as having indices attached to items" or
"indexed random access collection". I lean towards the latter
interpretation. This is no argument against having a unifying protocol
or mandating the former interpretation (perhaps with a name switch to
IIndexable?) and introducing an IRandomAccess protocol, just a comment
on my view of the current state of affairs.

Cheers,
Michał

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