Revision history of Data-Frame

0.006004    2024-12-20
    - update assignments etc so types match (https://github.com/PDLPorters/pdl/issues/511)

0.006003    2024-10-24
    - allow PDL::{Factor,Logical,SV} "initialize" to be instance methods

0.006002    2022-01-03 14:33:22-0500
    - Fix PDL::Factor's ngood, nbad methods for newer PDL versions.
      See <https://github.com/EntropyOrg/p5-Data-Frame/pull/34>.

0.006001    2022-01-02 18:29:06-0500
    - [BREAKING] Requires Perl >= 5.16, PDL >= 2.019

    - [DEPRECATION] Deprecating PDL::number_of_rows() in favor of PDL::length().
      (Both PDL::number_of_rows() and PDL::length() are methods mixed into PDL.)

    - Fixed compatibility with recent versions of PDL.

    - Autoboxing/role-mixing (via Data::Frame::Autobox and Data::Frame::PDL)
      to have a similar OO-interface across structures having some similarities,
      like Perl native array vs PDL piddle, Perl native hash vs Data::Frame's
      columns.

    - Data::Frame improvements
      - Added new methods to Data::Frame,
        PDL-style methods: at(), dims()/shape(), copy(), drop_bad(),
          slice(), set(), which(), dot-assignment
        Serialization methods: from_csv(), to_csv()
        Other methods: append(), id(), isempty(), merge(), rename(),
          sample(), summary(), sort(), split(), transform(), uniq()
      - Improved row/column via Data::Frame::Indexer.
      - Experimental features: syntax sugar for getting columns,
        R-like tidy_eval().
    
    - Reworked PDL::SV
      Added new PDL-style methods : copy(), glue(), uniqind(), set(), sever(),
        isbad(), isgood(), setbadif(), setbadtoval(),
        comparisons, dot-assignment
      Fixed methods: uniq()
      Improved stringification to honor $PDL::toolongtoprint
    - Reworked PDL::Factor
      Added new PDL-style methods : copy(), glue(), isbad(), isgood(),
        setbadif(), setbadtoval().
    - Implemented a basic PDL::Logical, which was empty module, for logical
      columns.

    - New Data::Frame::Examples module that provides a few example datasets:
      airquality, diamonds, economics, economics_long, faithfuld,
      iris, mpg, mtcars, txhousing.

    - Various doc improvements.

    - For developers 
      - New Test2::Tools::DataFrame module for testing Data::Frame.
      - Data::Frame::Setup and Data::Frame::Class as Import::Into packages.

0.003       2014-12-31 00:39:04-0600
    - add a role for Rlike data frames
          * support for methods: head(), tail(), subset()
    - use MooX::Traits to support loading roles easily
    - fix: select_rows() with no arguments should return an empty Data::Frame
    - bump PDL version to use its `unpdl()` method
    - Column::Helper now uses AUTOLOAD to make accessing columns easier in `subset()`

0.002       2014-12-25 03:34:04-0600
    - fix stringifiable length test

0.001       2014-12-23 18:25:37-0600
    - initial version