Earlier quoted context omitted.
I would say it ended up being much faster than had I written it by hand. It took a few days to produce this library -- it would almost certainly have taken me weeks to write it myself.
does reviewing have the same fidelity as writing ? reminded me of my university classes where i took my own notes vs studied someone else's notes. you can guess which one was superior.
But I don't think the final code is all that far off from what I would have written.