Curious function signature issue

["RasikaSrinivasan@gmail.com" <RasikaSrinivasan@gmail.com>]

all

I have a package P that looks like this:

package P is
   type Person_Type is private ;
   function Create( targetsfile : String := "targets.dat" ;
                    basalfile : String := "basal.dat" ;
                    isffile : String := "isf.dat" ;
                    icrfile : String := "icr.dat" )
                   return Person_Type ;
   function Create return Person_Type ;
   
....
....
end P ;

I am curious how gnat (2013 if it matters) can distinguish between the two overloaded "Create" functions?

The project built successfully though I am yet to exercise the runtime.

thanks for any clues, srini