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    }

    1;

=head1 PARAMETERS

=over 4

=item fix_arg 

Required argument when set to 1. The Fix containing the code fragment below needs 
two arguments.

    use Catmandu::Fix::Has;

    has message => (fix_arg => 1); # required parameter 1
    has number  => (fix_arg => 1); # required parameter 2

When the fix_arg is set to 'collect', then all arguments are read into an
array. The Fix containing the code fragment below needs at least 1 or more
arguments. All arguments will get collected into the C<messages> array:

    use Catmandu::Fix::Has;

    has messages => (fix_arg => 'collect'); # required parameter

=item fix_opt

Optional named argument when set to 1. The Fix containing the code fragment
below can have two optional arguments C<message: ...>, C<number: ...>:

    use Catmandu::Fix::Has;

    has message => (fix_opt => 1); # optional parameter 1
    has number  => (fix_opt => 1); # optional parameter 2

When the fix_opt is set to 'collect', then all optional argument are read into
an array. The Fix containing the code fragment below needs at least 1 or more
arguments. All arguments will get collected into the C<options> array:

    use Catmandu::Fix::Has;

    has options => (fix_opt => 'collect'); # optional parameter

=back

=head1 SEE ALSO