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      just autovivify it on demand. (Tim)
    - Avoid calling $self->primary_column in a loop in create() (Tim)
    - Use fetchrow_arrayref instead of fetchrow_array. (Tim)
    - Return from _deflated_column earlier if value is not a ref. (Tim)
    - Use $sth->{NAME_lc} instead of $sth->{NAME}. (Tim)
    - Optmize _normalized and normalize. (Tim)
    - optimise various calls to columns() (Tim)
    - don't reflesh after an update - defer for lazy loading
    - Iterator no longer inherits from Class::DBI itself.

  Bug Fixes
    - has_many maps now work as iterators
    - columns only report as being in group 'All' if they're in no
      other columns (so lazy loading works in those cases!)
    - calling create with a primary key of zero no longer attempts to 
      use auto_increment (Tim Bunce)

  Other
    - reference Class::DBI::AbstractSearch
    - retrieve_from_sql removes any leading 'WHERE' 
    - inflate handles overloading better (thanks to Tim Bunce)
    - Avoid boolean test on object, use defined instead.
    - Tweak create() to prepare for possible caching of colmap info.
    - better documentation on transactions
    - test suite now uses DBD::SQLite instead of DBD::CSV
    - consolidated some test scripts

0.90 Wed Nov 27 GMT 2002
    - hasa and associated_class merged (and deprecated) into has_a
      - has_many therefore no longer sets up reciprocal hasa
    - allow search() and search_like() to take multiple columns
    - added find_or_create()
    - add_constructor() is now preferred to make_filter()
    - added retrieve_from_sql() for inline SQL
    - documented running arbitrary SQL and using sth_to_objects to 
      convert these to objects. (Making sth_to_objects public too)
    - has_many can now call a mapping method on the results
      (for simpler many-to-many joins, for example)
    - has_many adds an 'add_to_<whatevers>' method 
      e.g.  CD->has_many(tracks => Track);
      now adds not just 'tracks' method, but also 'add_to_tracks'.
      (thanks to Michael Styer)
    - try to guess table name if none given
    - speed up iterators (thanks to Tom Renfro)
    - added (undocumented) data_type method
      (thanks to Tatsuhiko Miyagawa)
    - renamed column_type() to associated_class()
    - added references to Class::DBI::SQLite, Class::DBI::Pg,
      and Class::Join
    - before_create trigger can now modify object itself
    - uses UNIVERSAL::require instead of rolling our own
    - marked primary_key(), is_column(), add_hook() as deprecated
    - changed _ids_to_objects to receieve listref, rather than list
      to cope with weird bug in 5.005_03 (thanks to Tatsuhiko Miyagawa)
    - warn if column name clashes with built-in method
    - third argument to has_many is now optional, defaulting to our
      'class-name' (undocumented)
    - provide normalised method names if appropriate (i.e. a Film column
      will give us methods $obj->Film and $obj->film). This previously
      happened inconsistently.
    - split most of the column related code to Class::DBI::Columns
    - remove dependency on Class::Fields
    - reference the new Class::DBI mailing lists
    - Give better errors if no database connection set up 
      (thanks to Simon Cozens)
    - A failed create now calls $class->on_failed_create, which by
      default dies, but can be made to do whatever you like. 

0.89 Mon Jun 24 2002
    - allow has_many to not have a relationship 
      (Thanks to Brian Parker)
    - renamed (undocumented) min() and max() to 
      minimum_value_of() and maximum_value_of()
    - croak() and carp() deprecated in favour of _croak() and _carp()
    - primary() and essential() deprecated in favour of 
      primary_key() and _essential()/columns(essential);
    - normalize_one() deprecated in favour of _normalize_one
    - If a 'might-have' link points to nothing, don't give a 'Can't call
      method' error
    - better reporting on errors from create etc.
    - better reporting when you incorrectly set through hasa()
    - handle primary/foreign key value of zero better
      (reported by Jim O'Brien)
    - added (undocumented) 'column_type' based on ideas from
      Matthew Simon Cavalletto and Tatsuhiko Miyagawa.
    - brought delete triggers in line with documentation
      (reported by Barry Hoggard, fixed by Tatsuhiko Miyagawa)

0.88 Beltane 2000
    - fix for hasa() and create() with modified accessor/mutator names
      (Thanks to Schwern)

0.87 Fri Mar 29 2002
    * added might_have method
    - better MySQL autoincrement code (fixes occassional problems
       under mod_perl) [Thanks to Tatsuhiko Miyagawa]
    - fixed a test that was failing on 5.005 (but not 5.6.1) due to weird 
      interaction between overloaded iterator and Test::More's ok() 
      prototype  [Thanks to Tatsuhiko Miyagawa]

0.86 Fri Mar  8 GMT 2002
    * removed support for pseudo-hashes
    * hasa_list is now has_many 
      (although has_many still exists for backwards compatability)
    + has_many auto-generates reciprocal hasa decalaration
       (unless called as hasa_list, or with { nohasa => 1 })
    * searches now return iterators when used in scalar context
    - hooks are now called 'triggers' (using Class::Trigger)
    * new trigger for SELECT
    * added basic constraints
    + added support for filters on the same column
      (%s >= ? OR %s <= ?) 
    + added 'between' filter which provides this
    - deal better with the case where the only column group is 'All'
    - much internal twiddly stuff

0.36  Wed Nov 28 2001
    + tests no loner die horribly if you don't have MySQL installed
    - minor tweaks to some error messages
    - bugfixes for problems with auto-deleting objects
    - bugfix for mis-normalized accessor warning