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Description
The generate_target function of ninja backend takes 55s for me on master, but 84s on the optionrefactors branch.
It seems it spends a lot of time constructing OptionKey objects. I think the @total_ordering decorator is one cause of that. Removing it allowed to reduce time to 64s in my profile.
Also, the __eq__ operator should use the _hash member instead of comparing tuples.