IDL4CSP — Do the copy and all values constructors make deep copies or shallow copies?

The current version of the specification does not specify whether copy constructors and all value constructors do deep copies or shallow copies. The specification should indicate what's expected from an implementation to avoid problems. such as those highlighted here.

Introduce Clarifications about Copying Behavior in Constructors and Setters

This resolution clarifies the copy behavior (whether shallow or deep copies must be performed) in constructors and setters. Also, it clarifies how the @external annotations affects such behavior.

This resolution shall be applied after applying the changes introduced in the resolution of IDL4CSP-1.