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Methods Implementation

`ARG` | Returns a pointer to a method argument.
`BEGIN_METHOD` | Begins the implementation of a method that takes at least one argument.
`BEGIN_METHOD_VOID` | Begins the implementation of a method that takes no argument.
`END_METHOD` | Ends the implementation of a method.
`GB.NParam` | Returns the number of variable arguments of a method.
`LENGTH` | Returns the length of a string method argument.
`MISSING` | Returns if an optional argument has a value.
`STRING` | Returns the address of a string method argument.
`VARG` | Returns the value of a method argument.
`VARGOPT` | Returns the value of an optional method argument.