Don't re-quote nodes which are already quoted
Don't re-quote nodes which are already quoted

We're going to start working on removing type casting from arel. To
avoid doing one gigantic commit which moves everything over to eager
casting, we need a way to tell Arel that we've already cast it. The
easiest path to that is to give it a quoted node, and then we remove
this case once we're never returning a Casted node

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