I agree it's too limited to be called Magic::Attach. That would be a good name for a helper module used to implement such a thing, something you wish you had instead of having to write in XS.

The use of the ~ table is meerly an implementation detail. What the module does is attach named attributes to a value at run time. It should be named for its public interface and purpose, not for its implementation details. (Save that name for a concrete implementation when the same interface is implemented multiple ways based on the situation).

This concept is what Perl 6 calls "Properties", and LISP also calls it properties. It's different from the existing Perl attributes or attribs.

—John