maybe fix for #22
Revert "maybe fix for #22"

It made it twice as slow.

This reverts commit 0ab917798b7035072ac1601b394a1236d8d164fe.
better fix for #22 daybreak forces binary encoding"
better test for utf-8
improve serializer encoding issue a bit
add failing test for frozen key
fix encoding for frozen keys
uncomment other benchmarks
0.2.3