Fix null handling for cast ExprTK functions
#3040
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Signed-off-by: Andrew Stein <steinlink@gmail.com>
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This PR modifies the behavior of the
nullliteral in ExprTK expressions to preservenullwhen being cast e.g.float(null), which is required to satisfy the type checker for e.g. branching. A test has been added for this case - I don't think this can be called a regression since it's always been the case, but it is at least a bug.