History of X16TestBench::__toint8 1 change

In testbench/testbench.py, lines 88–93 on 6b218d3faaaffff04280826be759421e92e7922d09c3662a9194a316c9c5d750. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 88,93:testbench/testbench.py.