Nice writeup. Rust deals with the mutable part of this triple-whammy by adding mut syntax into the language to mark a binding as mutable.
In this way, all variables are immutable unless they are explicitely marked as mutable. Trying to modify an immutable variable will result in a compile-time error. It also has the added benefit of allowing the compiler to warn you if you've marked a variable as mutable unnecessarily.
I think this helps keep the thought of immutability in your mind when programming. It also allows another developer to know which parts of a program contain mutable state.
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