NAME
    Marlin::X::UndefTolerant - Marlin extension to make your constructor
    forgive undefs.

SYNOPSIS
      package Local::Date {
        use Types::Common 'Int';
        use Marlin ':UndefTolerant',
          'year?'  => Int,
          'month?' => Int,
          'day?'   => Int;
      }
  
      my $xmas = Local::Date->new( day => 25, month => 12, year => undef );
      $xmas->has_day;     # true
      $xmas->has_month;   # true
      $xmas->has_year;    # false

IMPORTING THIS MODULE
    The standard way to import Marlin extensions is to include them in the
    list passed to `use Marlin`:

      package Local::Date {
        use Types::Common 'Int';
        use Marlin ':UndefTolerant',
          'year?'  => Int,
          'month?' => Int,
          'day?'   => Int;
      }

    It is possible to additionally load it with `use
    Marlin::X::UndefTolerant`, which won't *do* anything, but might be useful
    to automatic dependency analysis.

      package Local::Date {
        use Types::Common 'Int';
        use Marlin::X::UndefTolerant;
        use Marlin ':UndefTolerant',
          'year?'  => Int,
          'month?' => Int,
          'day?'   => Int;
      }

DESCRIPTION
    Marlin has a built-in feature for making attributes undef-tolerant. It
    makes the constructor treat `attributename => undef` as being equivalent
    to not passing the value to the constructor at all.

    However, adding `undef_tolerant => true` to all your attributes is
    annoying, so this extension does it for you.

    You can override it on a per-attribute basis by setting `undef_tolerant =>
    false` explicitly.

    It will also skip any attributes which:

    *   Are required attributes;

    *   Have an `undef` init_arg; or

    *   Have an explicit type constraint defined which allows `undef` as a
        valid value (for example Maybe[Str] or Bool).

BUGS
    Please report any bugs to
    <https://github.com/tobyink/p5-marlin-x-undeftolerant/issues>.

SEE ALSO
    Marlin.

AUTHOR
    Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE
    This software is copyright (c) 2026 by Toby Inkster.

    This is free software; you can redistribute it and/or modify it under the
    same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES
    THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
    WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
    MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

    🐟🐟