Block scoped func decl id scoping

[Peter van der Zee]

I think Tenko currently doesn't properly scope the id of a function declaration that's inside a block (or switch).

If I understand properly now then in strict mode it becomes a let that is hoisted within the block and if not strict mode then it becomes a var that is hoisted within the block.

So:

{
  f();
  function f(){}
}

In context of where f binds, is really

{
  var f = function(){}
  f();
}

(Note the discrepancies with .name and some other things. This is only supposed to illustrate how f binds.)

While

"use strict";
{
  function f(){}
  f();
}

Is really

"use strict";
{
  let f = function(){}
  f();
}

Works the same in global, in functions, and in switches.