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Right now, Ditto discards any REMOVE op that is received before its corresponding INSERT op. This leads to inconsistencies in the following case:
site1: INSERT(A) -> op1
site2: EXECUTE(op1)
site2: REMOVE(A) -> op2
site3: EXECUTE(op2)
site3: EXECUTE(op1)
This PR fixes the bug by caching any REMOVE op received before its corresponding INSERT op and executing the REMOVE op once the INSERT has been executed.