[Area] Interfaces [Syntax rule] Implementation of an interface method must match the parameter signature exactly Now the parameter signatures of the method must exactly match between the interface and the implementation of the method on a class. Also, the return types must match exactly. For more information, see Interfaces Overview.
Suppose an interface had a method that input a parameter of an int. In a class that implements the interface, it was possible to write the method with a parameter of a str.