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Bad habits, arguably. Been using JS for years so occasionally instances where a more vigilant self would use "let" still get "var" instead. I think part of this is because of issues with previous versions of v8/node where using let at the global level or without 'use strict' threw errors.

That being said, "const" is already hardwired.

to get variable defined in function scope? :)

I know right. Principle of least Privilege. Simple.