ObjStore::AVHV - Hash interface, array performance

  package MatchMaker::Person;
  use base 'ObjStore::AVHV';
  use fields qw( height hairstyle haircolor shoetype favorites );

Support for extremely efficient records.

Even without optimization or benchmarks, the memory savings achieved by factoring the hash keys is quite significant and a large performance win. Perl implements a similar strategy by globally sharing hash keys across all (transient) hashes.

* More documentation

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This could be implemented with zero per-record overhead if we stored the layout in a per-class global. This would definitely be slower though.