In their diff example, line 33 on the left and 35 on the right are shown to be unchanged, however the indent isn't the same... Seems like they've hardcoded this example incorrectly unless I'm missing something? Left line 32 is removing a bracket at indent level 2, left line 33 is unchanged bracket at indent level 1, but there's now one less bracket at level 1 in the right side, even though no bracket at level 1 was removed?