# 4898 Mismatched Method Declarations with Default Parameters Not Caught by the Compiler

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In Delphi , if you define default parameter values for methods or functions in the interface part of a unit, you don't have to repeat that in the implementation part. Example below.

"s" is "Undefined". Same with integers, they are NaN.

Imho, this is a very serious problem because the code does not behave as expected, and you have to change all your code, hoping that you find all places. Or you don't use default values at all.

Even a compiler error like "Default values in interface, but not in implementation" would help.