default instance for IsString

Evan Laforge qdunkan at
Tue Apr 24 21:36:23 CEST 2012

> So if every value, when forced, can crash your program, possibly depending
> on what type it's instantiated to, why are we so concerned about String
> literals behaving like everything else?

Well, that was exactly my point.  Some people think it's *more likely*
that people will write crashing fromString methods.

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