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Integer with no initial value

Integer with no initial value

I would like to be able to create an integer parameter with a blank value until it has been defined.  Zero is a valid value and I would like to not have a value assigned until the object has been reviewed and the correct value determined.  After the value has been entered there is no need to be able to go back to a blank, but it would be nice to be able to have an initial value of NULL.