How easy is it to switch from milkman to mixer?

I have some code using milkman. How hard would it be to switch from milkman to mixer?

Already, I see that my `milkman.deliver` calls will have to use a non-saving `Mixer(commit=False)` instance. What other differences should I be aware of?

I'm just curious: Is any of the mixer code taken directly from the milkman project?
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Start by reviewing the existing mixer usage around `Mixer(commit=False)` and compare it with the reported `milkman.deliver` calls. Document the migration differences and clarify whether any mixer code was taken directly from milkman; done means the comparison answers both questions for users considering the switch.

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