I just encountered a problem with recur, I never came across before.
Am trying to generate `coll-reduce` implementations over primitive
nd-arrays and get bitten by special type restrictions on recur args if
they're an initially primitive value (using 1.7.0-RC2):

(loop [acc (aget ^bytes a 0) i 1]
  (if (< i 2)
    (recur (+ acc (aget ^bytes a i)) (inc i))))

CompilerException java.lang.IllegalArgumentException:
recur arg for primitive local: acc is not matching primitive, had:
long, needed: byte

Is there any way to avoid this compiler error, since I can't predict
what type the reduction fn (`+` in the example) will return...

Usually one wants of course as little boxing as possible, but here're
I'd very much like to, but don't know how to do so with that initial
`acc` val...

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