[erlang-questions] when is data copied?

[Xavier Noria]

I would like to have a mental model for data copying in Erlang.

By that I mean immutability is in my view a property of an API, but I
suppose the implementation, compiler optimizations, etc., can precisely
leverage that property to reuse stuff behind the scenes for performance.

Would you recommend any particular article, talk, book, ..., that would
help me get an idea of how that works in Erlang?
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