CustomTypes and expression avaluation

[thomasmcneill]

I implement a custom type and it works as expected but what isn't expected is when there is a typo or invalid parameter to the custom type it just returns false rather than throwing an exception.

Example
Correct
Rule1.Expression = "RuleUtils.SetChangeType(input1) == true ";
Invalid
Rule1.Expression = "RuleUtils.SetChangeType(input1.Name) == true ";

If someone creates the expression and it doesn't find the right function to call in the static class it just fails it. Is there a way for it to throw an exception instead so we know something is wrong with the rule?