After experimenting, I learnt the following:
    

  * the static keyword informs the compiler that the value is known at compile 
time
  * object invariants can't have the same property in each case of match
  * runtime dispatch uses dispatch trees which are more performant than the 
more common indirect branches



Therefore, because I want each Specialised Something to have the same set of 
properties, runtime dispatch is my friend.

Thanks both :-)

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