race_number.rb

Number used to identify a Person during a Race: bib number. RaceNumbers are issued from a NumberIssuer, which is usually a racing Association, but sometimes an Event.

In the past, RaceNumbers had to be unique for NumberIssuer, Discipline and year. But we allow duplicates now.

Value is the number on the physical number plate. RaceNumber values can have letters and numbers

This all may seem to be a case or over-modelling, but it refleccts how numbers are used by promoters and associations. PersonNumbers are also used to differentiate between People with the same name, and to identify person results with misspelled names.