That feels like a situation that could easily end up (copy pasting something, someone adding another var, ...) in an unexpected global variable declaration.

That feels like a situation that could easily end up (copy pasting something, someone adding another var, ...) in an unexpected global variable declaration. var foo = 4, bar = 5, baz = 6, sprinkles = 'wee'; qux = 'quux'; Making `qux` global.