Datasets.nCopies can produce PeekableBuffers
Datasets.nCopies can produce PeekableBuffers

We can now test PeekableBuffer performance on apps with a meaningful
input size.  Unfortunately they're slower than serial copies, at least
on my Surface Pro 2 (though they should scale better to large core
counts).  This is unexpected, as even on small machines we're
eliminating a copy from the Buffer to the ConcreteStorage array.

jbosboom/streamjit,jbosboom/streamjit