You should consider using https://metacpan.org/author/ODUCS instead of search.cpan.org as the latter is being shut down in a few days.

Random ideas that I think would make cool modules:

• A version of Class::XSAccessor that allows you to create accessors which only accept certain types. For example, Class::XSAccessor allows you to create methods for your class along the lines of:

  # use Class::XSAccessor { getters => ['foo'] };
  # is equivalent to:
  
  sub foo {
    my $self = shift;
    if (@_) {
      $self->{foo} = $_[0];
    }
    $self->{foo};
  }
  
  # use YourModule { getters => { bar => { isa => "HASH" } } }
  # is equivalent to:
  
  sub bar {
    my $self = shift;
    if (@_) {
      die "not a HASH" unless ref $_[0] eq "HASH";
      $self->{bar} = $_[0];
    }
    $self->{bar};
  }
  [download]

  Should support all of Perl's built-in reference types (HASH, ARRAY, etc) and maybe a handful of other useful types like integers, numbers, strings, blessed objects (check isa), etc.

  Happy to chat more about API design etc.

  This would be pretty useful to the Moose/Moo ecosystem.

• An XS implementation of mkopt from Data::OptList would be cool.

Okay, so two ideas is all I have right now.