Profiling is showing a lot of time spent in RT.longCast, in places like 
this:

(aget flat-dict (bit-and 0xff (aget arr j)))

arr is hinted as ^bytes, and flat-dict as ^objects.

which compiles to this:

Object code2 = RT.aget((Object[])flat_dict, RT.intCast(0xFFL & 
RT.longCast((Object)RT.aget((byte[])arr2, RT.intCast(k)))))

Is there any way to avoid that RT.longCast? There is an aget method in 
RT.java that returns a byte, and a longCast for byte, but I suspect the 
cast to Object is causing it to hit the longCast for Object, which does a 
bunch of reflection.

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