Fix binary op base cases#2132
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Summary
Fixes a latent contract bug in
ast.BinaryOp.Andand tightens up the few call sites that were already working around it with extra branching.After this fix,
BinaryOp.And(...)can now handle 0/1/N arguments:And()(no args) returns NoneAnd(x)returnsxAnd(x, y, …)returns a foldedBinaryOpTest Plan
make checkpassesmake testshows 100% unit test coverageDeployment Plan