[r-t] Calls in Doubles

Mark Davies mark at snowtiger.net
Thu Aug 5 22:29:52 UTC 2010

Graham Hayward writes,

 > one of the above will be the usual lead end of the method, two of
 > them will be natural calls which can be used to produce an extent and
 > one will run false

Not forgetting there's a fifth type of call which is false for almost 
all Doubles methods.


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