What I'm saying is that any attempt to enforce encapsulation is ultimately futile when the other person has the source and can simply change your code to expose things that they want.

You are completely missing the point of inside-out objects. The point of inside-out object isn't to prevent accessing data. The point of inside-out objects is on the one hand to prevent accidental access of data (collisions), and on the other hand to give you compile time errors when making typos in the attribute names.

Inside-out objects is to OO programming what 'use strict', lexical variables, and name-spaces are to non-OO Perl programming. None of it prevents anyone from getting to anything one wants - but that doesn't mean 'use strict', lexical variables and name-spaces aren't very good ideas.