Accessing private properties from an external function with `this` parameter

[roddolf]

If I have a class with a private property:

class MyClass {
  private privateProperty;
}

I would expect that having a function with the this parameter as the class I could access to the private property of the class:

function myFunction( this:MyClass ) {
  this.privateProperty; // Gives an error
}

Since I'm specifying where the function is running, shouldn't it be treated as if it's "inside" the class?

[aluanhaddad]

This is a duplicate of #17694

[mhegazy]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.