Invocation of values of type constructor{?} allowed without argument checking

[mor-n4]

Values of type Function can be invoked with call expressions and no checking of arguments and their types will be performed:

let fn: Function;
fn(); // no error
fn("", 42); // no error

However, this behavior is also applied to values of type constructor{?} (and for consistency also to values of a type that contains a construct signature without a call signature), which is probably(!) not desired:

let ctor: constructor{?};
ctor(); // no error
ctor("hello", 42); // no error

This should be reconsidered!

Also check tests in file CallConstructSignature_usage1.n4js.xt (search for **) and search the code base for TODO GH-2279.