Allows you to perform math on any kind of data structure that follows the Numeric behaviour

Any module that wants to be a Numeric type, and to be able to be called by the functions in Number, should make sure that this behaviour is followed

Raised when add/2, sub/2, mult/2 or div/2 is called with two different kinds of structs as arguments

Raised by coerce/2 when coercion is not possible