Verbose and flexible args and kwargs syntax

[Eelco]

> > Python users generally follow the rule "explicit is better than
> > implicit".  Setting a general constraint and letting the language "do
> > the right thing" is a kind of black magic that feels off because it
> > tends to break that rule.  But that's not to say that black magic
> > never wins -- just look at super() and the MRO.
>
> We are not talking black magic here; we are talking about an EXPLICIT
> type constraint provided on the very same line.

To hammer that point home: would you say the following C# code
performs 'black magic'?

float x = 3;

After all, exactly the same thing is going on; C# will 'do the right
thing'; convert the integer literal 3 to a floating point value, based
on the type constraint placed on x.