History of build 1 change

In tests/mutation_check.py, lines 708–724 on 2980b7b6d7cdf3928225cc12b965cc5c497b02b98a2ab5cf271549a7dfbe0c1e. 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 708,724:tests/mutation_check.py.