Hi,

While implementing qsort with clojure for fun, I thought about using
transient vectors to speed up sorting vs the "naive" functional
implementation.

I need an *into!* version of *into *when joining two sorted subarrays and I
was wondering why there isn't one.

It seems that (source into) does in fact support a transient collection as
the first argument, however it calls persistent! on the result.

What was the rationale behind the decision? (Note: I'm not questioning it,
just interested.)
Is there a particular reason why this feature remains undocumented?

-- 
László Török

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