> Lua also essentially got lexical scoping of local variables correct from the beginning while js blessed us with the nightmare of var.

That was not my experience when I was working with lua. Did anything change since? Asked google. Answered :

> In Lua, if a variable is assigned a value inside a function without being explicitly declared with the local keyword, it will automatically become a global variable. This is because, by default, all variables in Lua are global unless explicitly specified as local.