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Magical value of collections revisited

Isabelle Dussauge’s interesting comment to the earlier post on magical value of collections disappeared in some temporary spam comment box for a whole month — so we’ve reissued it below. Sorry for the fuzz, Isabelle!

Isabelle Dussauge’s interesting comment to the earlier post on magical value of collections disappeared in some temporary spam comment box for a whole month — so we’ve reissued it below. Sorry for the fuzz, Isabelle!