If you assume that @"" string constants are NOT globally uniqued in
a binary, but only to a given compilation unit, then
ThisClassUniqueObservationContext could be a constant string:
There is the chance that someone else will use the string
@"FBFroobazzleValueObservationContext" as an observation context
elsewhere in the inheritance tree, but I think that a) it would be a
programmer error b) is probably not worth losing any sleep over.
And there is certainly a smaller chance of a collision than with an
arbitrarily picked number.
Jim
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