More like a nitpick than a bug... anyway.

 From the preamble:

As of 2.8a2096 (non-flagship),
MappedCollection>>storeString does not answer the correct source.

  Compiler evaluate:
   (MappedCollection collection: 'CBA' map: #(3 2 1)) storeString

yields a MNU.
A minor tweak is needed in MappedCollection>>storeOn:

Cheers,
Helge

P.S. Hi sma, I guess we can't thank you enough for collating and 
coordinating fixes and enhancements. I'll do it anyway: Thanks!
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