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It turns out to be more complicated than I thought. Tracing deeper I see that the statement and arguments are cloned before being executed, but the clone method changes the value of the passed-in argument to one of the default value. It's a little odd how the clone operation works. Since the clone method can't rely on the original object having implemented Cloneable, it writes the original object out as an Expression, and then evaluates that Expression as the cloned object. Clever, if it only worked-- the value as read is not the value as (should be) written. I wonder if anybody here has been down this primrose path before?
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