`String.prototype.charCodeAt` accepts `undefined`

[mollthecoder]

Take the following example:

"Hello, world!".charCodeAt();

This is safe, because undefined is automatically converted to zero. It is equivalent to this:

"Hello, world!".charCodeAt(0);

Or this:

"H".charCodeAt(0);

However, it is currently marked as a required argument.

[HolgerJeromin]

Would that change be only spec conform or really useful? I think many/some calls with variables with undefined are bugs/unintentional.

[saschanaz]

This should go https://github.com/microsoft/TypeScript as the code resides there.

[RyanCavanaugh]

This is the intended behavior.