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Personally, I don't like these two kinds of syntax for declaring and assigning a mutable variable, because if code is moved around - which happens all the time - I have to switch the syntax for declaration vs assignment. Same thing with Go's := and =.

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The vast majority of variables in your program won't be mutable or be changed around so why add the mental burden of mutability on every single variable just for some tiny minority of cases?

It doesn't have to be a mental burden.. Just write all your variables as mutable then let the ide automatically correct them to immutable. Ex: "Warning: This variable is never mutated. Would like to make it a const? <Fix>"

Let's say it is a mental burden. I'd rather have the burden when writing the code over when reading the code. (https://news.ycombinator.com/item?id=31823991)

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