Consider passing interface references by value instead by reference for interface method calls

[gprossliner]

In v2 default interfaces will be created for each object (see #10). So you access object.interface_name to get a reference.

Currently in v1, the public interface methods are rendered like:
void interface_name_foo(interface * reference)

So you need to pass pointer to the interface.
This could be changed to passing a copy of the reference:
void interface_name_foo(interface reference)

PROS:

• Cleaner API
• No accidental modification of the reference in the implementation

CONT:

• Instead of passing one pointer-sized field, the compiler has to pass a struct containing two pointer-sized fields (object and methodtable)

Decision is not finally...