Whoa, that I did not know! I know you said the VM does this but to ask a stupid question anyway: is this something the pipe operator enables or does Erlang do this too?
Otherwise, I’ve always thought of “mutability” to always refer to physically changing the memory, or at the very least immediately freeing the previous allocation. Under that definition even same-scope rebinds have not been mutated, though ya, you could say the “variable” was mutated. So maybe mut isn’t so off-base. But I could still see it causing confusion as I can’t be the only one who made that assumption—unless I am 
