markijbema/redis — comment on commit 792c90d83ef8c8ad0c1cc13d24c026f4f0b93e87
File: src/t_set.c line 634
By ttencate:

For a diff operation, the first set is "special" (the operation does not commute). I'd put the j==0 case outside the for loop and save some branching and indentation levels here.