That's a bad strategy. The reason people are tempted to mess with internals is that it works most of the time. Unless the library has some way of punishing people who use them, then they'll just do it without regard for, as far as they're concerned, arbitrary toothless restrictions. Sure, some stuff will break, but that's true even if they're respecting the API boundary too, especially for a beginner. There will be zero learning about API boundaries in particular.

Yeah, you learn valuable lessons like “don’t mess with the code this guy makes, he puts traps on it”