Backport to_bytes performance optimizations #121
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Backports #94 and #112.
We had some performance issues and found out that
to_bytes()has a quadratic complexity with respect to the number of chunks in the BufList (in our case it was taking 10 minutes to runto_byteson a ~65MB body). This has been already fixed in1.x, but0.4.xseems to be still widely used, so it would be nice to have this fix there as well.