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  Significantly optimized method dispatch via cache (Dave Mitchell)
  Significantly optimized DBI internals for threads (Dave Mitchell)
    Dave's work on these optimizations was sponsored by Booking.com.
  Xsub to xsub calling optimization now enabled for threaded perls.
  Corrected typo in example in docs (David Precious)
  Added note that calling clone() without an arg may warn in future.
  Minor changes to the install_method() docs in DBI::DBD.
  Updated dbipport.h from Devel::PPPort 3.20

1.617 - 2012-01-30, Tim Bunce (svn r15107)

  NOTE: The officially supported minimum perl version will change
  from perl 5.8.1 (2003) to perl 5.8.3 (2004) in a future release.
  (The last change, from perl 5.6 to 5.8.1, was announced
  in July 2008 and implemented in DBI 1.611 in April 2010.)

  Fixed ParamTypes example in the pod (Martin J. Evans)
  Fixed the definition of ArrayTupleStatus and remove confusion over
    rows affected in list context of execute_array (Martin J. Evans)
  Fixed sql_type_cast example and typo in errors (Martin J. Evans)
  Fixed Gofer error handling for keeperr methods like ping (Tim Bunce)
  Fixed $dbh->clone({}) RT73250 (Tim Bunce)
  Fixed is_nested_call logic error RT73118 (Reini Urban)

  Enhanced performance for threaded perls (Dave Mitchell, Tim Bunce)
    Dave's work on this optimization was sponsored by Booking.com.
  Enhanced and standardized driver trace level mechanism (Tim Bunce)
  Removed old code that was an inneffective attempt to detect
    people doing DBI->{Attrib}.
  Clear ParamValues on bind_param param count error RT66127 (Tim Bunce)
  Changed DBI::ProxyServer to require DBI at compile-time RT62672 (Tim Bunce)

  Added pod for default_user to DBI::DBD (Martin J. Evans)
  Added CON, ENC and DBD trace flags and extended 09trace.t (Martin J. Evans)
  Added TXN trace flags and applied CON and TXN to relevant methods (Tim Bunce)
  Added some more fetchall_arrayref(..., $maxrows) tests (Tim Bunce)
  Clarified docs for fetchall_arrayref called on an inactive handle.
  Clarified docs for clone method (Tim Bunce)
  Added note to DBI::Profile about async queries (Marcel Grünauer).
  Reserved spatialite_ as a driver prefix for DBD::Spatialite
  Reserved mo_ as a driver prefix for DBD::MO
  Updated link to the SQL Reunion 95 docs, RT69577 (Ash Daminato)
  Changed links for DBI recipes. RT73286 (Martin J. Evans)

1.616 - 2010-12-30, Tim Bunce (svn r14616)

  Fixed spurious dbi_profile lines written to the log when
    profiling is enabled and a trace flag, like SQL, is used.
  Fixed to recognize SQL::Statement errors even if instantiated
    with RaiseError=0 (Jens Rehsack)
  Fixed RT#61513 by catching attribute assignment to tied table access
    interface (Jens Rehsack)
  Fixing some misbehavior of DBD::File when running within the Gofer
    server.
  Fixed compiler warnings RT#62640

  Optimized connect() to remove redundant FETCH of \%attrib values.
  Improved initialization phases in DBI::DBD::SqlEngine (Jens Rehsack)

  Added DBD::Gofer::Transport::corostream. An experimental proof-of-concept
    transport that enables asynchronous database calls with few code changes.
    It enables asynchronous use of DBI frameworks like DBIx::Class.

  Added additional notes on DBDs which avoid creating a statement in
    the do() method and the effects on error handlers (Martin J. Evans)
  Adding new attribute "sql_dialect" to DBI::DBD::SqlEngine to allow
    users control used SQL dialect (ANSI, CSV or AnyData), defaults to
    CSV (Jens Rehsack)
  Add documentation for DBI::DBD::SqlEngine attributes (Jens Rehsack)
  Documented dbd_st_execute return (Martin J. Evans)
  Fixed typo in InactiveDestroy thanks to Emmanuel Rodriguez.

1.615 - 2010-09-21, Tim Bunce (svn r14438)

  Fixed t/51dbm_file for file/directory names with whitespaces in them
    RT#61445 (Jens Rehsack)
  Fixed compiler warnings from ignored hv_store result (Martin J. Evans)
  Fixed portability to VMS (Craig A. Berry)

1.614 - 2010-09-17, Tim Bunce (svn r14408)

  Fixed bind_param () in DBI::DBD::SqlEngine (rt#61281)
  Fixed internals to not refer to old perl symbols that
    will no longer be visible in perl >5.13.3 (Andreas Koenig)
    Many compiled drivers are likely to need updating.
  Fixed issue in DBD::File when absolute filename is used as table name
    (Jens Rehsack)
  Croak manually when file after tie doesn't exists in DBD::DBM
    when it have to exists (Jens Rehsack)
  Fixed issue in DBD::File when users set individual file name for tables
    via f_meta compatibility interface - reported by H.Merijn Brand while
    working on RT#61168 (Jens Rehsack)

  Changed 50dbm_simple to simplify and fix problems (Martin J. Evans)
  Changed 50dbm_simple to skip aggregation tests when not using
    SQL::Statement (Jens Rehsack)
  Minor speed improvements in DBD::File (Jens Rehsack)

  Added $h->{AutoInactiveDestroy} as simpler safer form of
    $h->{InactiveDestroy} (David E. Wheeler)
  Added ability for parallel testing "prove -j4 ..." (Jens Rehsack)
  Added tests for delete in DBM (H.Merijn Brand)
  Added test for absolute filename as table to 51dbm_file (Jens Rehsack)
  Added two initialization phases to DBI::DBD::SqlEngine (Jens Rehsack)
  Added improved developers documentation for DBI::DBD::SqlEngine
    (Jens Rehsack)
  Added guides how to write DBI drivers using DBI::DBD::SqlEngine
    or DBD::File (Jens Rehsack)
  Added register_compat_map() and table_meta_attr_changed() to
    DBD::File::Table to support clean fix of RT#61168 (Jens Rehsack)

1.613 - 2010-07-22, Tim Bunce (svn r14271)

  Fixed Win32 prerequisite module from PathTools to File::Spec.

  Changed attribute headings and fixed references in DBI pod (Martin J. Evans)
  Corrected typos in DBI::FAQ and DBI::ProxyServer (Ansgar Burchardt)

1.612 - 2010-07-16, Tim Bunce (svn r14254)