`const` function arguments and object property shorthand

[Alexander Jones]

Propose:

    function(const foo, const bar) {
    }

    {
        const foo: bar
    }

Such that the names foo and bar are not assignable in the function body or
as an object property - such assignment would ideally have identical
behaviour to assigning to a const variable, i.e. a SyntaxError, although in
the object case, as the 'constness' is not statically determinable, so I
think this would have to just behave like a non writable property, or throw
a runtime error instead.

Possible equivalence to:

    function(foo_, bar_) {
        const foo = foo_;
        const bar = bar_;
    }

    Object.create(Object.prototype, {
        foo: {enumerable: true},
    })

Cheers
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