I don't really understand what you're saying here. `let` is the way JavaScript should have worked from the beginning: a sensible implementation of lexical scope

I don't really understand what you're saying here. `let` is the way JavaScript should have worked from the beginning: a sensible implementation of lexical scope. How can you possibly make an argument for `var`? What is "procedural block scope"? Why does a proper implementation of lexical scope damage "thinking properly about flow"? I just don't get it.