enable DefaultArguments functions with mismatch signature - #4518

Here i no need to be increased? I'd suggest to cleanup this foreach to make it more readable, for example,

int i = 0;
foreach (var param in descriptor.Parameters)
{
    i++;
    ...
}

Here we compare the type, and if type mismatch, then may choose using default argument. What happen if a function is overloaded? For example,

Foo(Point p1 = default point 2, Point p2 = default point 1);
Foo(Line l1, Line l2);

And we open a .dyn whose signature is Foo@Line,Line, will it be changed to Foo@Point,Point and use default argument?

In case the new parameter is added in the beginning, for example
old param: double
new param: Point,double
then when comparing Point and double, we shouldn't increase i

If the signature in the file is Foo@Line,Line then the descriptor MangledName is also Foo@Line,Line so the condition is evaluated as false and this step is skipped. The function will still be Foo@Line,Line not Foo@Point,Point.

nice