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Add Rel8.TH.deriveRel8able #141

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Add Rel8.TH.deriveRel8able #141

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@ocharles ocharles commented Nov 7, 2021

This Template Haskell function derives Rel8able instances, like the Generic deriving strategy. If my hypothesis in #136 is right, this may lead to faster compilation times for modules that need to derive Rel8able instances.

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ocharles commented Nov 7, 2021

So far this is looking quite promising. On my laptop, CircuitHub.Model.Order takes 8.7s to compile, but using deriveRel8able it takes 3.8s - so a good 2.3x speedup. This work is not at all complete yet though - there's no labels, and no support for anything except Column. Hopefully adding that in still keeps us above 2x though.

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