Array contract deduplication #1674
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Following #1646, this PR implements contract deduplication for arrays as well. It doesn't seem to gain a lot on the codebase used as part of #1622, but isn't pessimization either. It's expected to be useful when concatenating array of like elements, where we can keep the lazyness of contract.
Eventually, I think it would be best to be able to control all those optimizations with flags or configuration anyway.