Disagree with validating that sort of input in code you (the non-framework/BCL author) write; let the operators, functions, etc., do their own work of deciding

Disagree with validating that sort of input in code you (the non-framework/BCL author) write; let the operators, functions, etc., do their own work of deciding if their operands are acceptable. Otherwise, where does it end--do you pre-test two integers to verify their product won't overflow the type declared for their product? I think you gotta let the exception happen.