this is almost a workaround for the lack of named parameters

[J]

The bigger point here is more profound: it is trivial to 
implement named parameters using structs + trivial lowerings, and 
this is no way conflicts with function overloading.

D deserves to have named parameters to functions -- it makes for 
much more legible code, and obviates the need for slow builder 
patterns.  Readable and speedable. It's win-win.