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    return spiffy_mixin_import(scalar(caller(0)), $self_package, @export_list)
      if $args->{-mixin};

    $filter_dump = 1 if $args->{-filter_dump};
    $filter_save = 1 if $args->{-filter_save};
    $dump = 'yaml' if $args->{-yaml};
    $dump = 'dumper' if $args->{-dumper};

    local @EXPORT_BASE = @EXPORT_BASE;

    if ($args->{-XXX}) {
        push @EXPORT_BASE, @{$EXPORT_TAGS{XXX}}
          unless grep /^XXX$/, @EXPORT_BASE;
    }

    spiffy_filter() 
      if ($args->{-selfless} or $args->{-Base}) and 
         not $filtered_files->{(caller($stack_frame))[1]}++;

    my $caller_package = $args->{-package} || caller($stack_frame);
    push @{"$caller_package\::ISA"}, $self_package
      if $args->{-Base} or $args->{-base};

    for my $class (@{all_my_bases($self_package)}) {
        next unless $class->isa('Spiffy');
        my @export = grep {
            not defined &{"$caller_package\::$_"};
        } ( @{"$class\::EXPORT"}, 
            ($args->{-Base} or $args->{-base})
              ? @{"$class\::EXPORT_BASE"} : (),
          );
        my @export_ok = grep {
            not defined &{"$caller_package\::$_"};
        } @{"$class\::EXPORT_OK"};

        # Avoid calling the expensive Exporter::export 
        # if there is nothing to do (optimization)
        my %exportable = map { ($_, 1) } @export, @export_ok;
        next unless keys %exportable;

        my @export_save = @{"$class\::EXPORT"};
        my @export_ok_save = @{"$class\::EXPORT_OK"};
        @{"$class\::EXPORT"} = @export;
        @{"$class\::EXPORT_OK"} = @export_ok;
        my @list = grep {
            (my $v = $_) =~ s/^[\!\:]//;
            $exportable{$v} or ${"$class\::EXPORT_TAGS"}{$v};
        } @export_list;
        Exporter::export($class, $caller_package, @list);
        @{"$class\::EXPORT"} = @export_save;
        @{"$class\::EXPORT_OK"} = @export_ok_save;
    }
}

sub spiffy_filter {
    require Filter::Util::Call;
    my $done = 0;
    Filter::Util::Call::filter_add(
        sub {
            return 0 if $done;
            my ($data, $end) = ('', '');
            while (my $status = Filter::Util::Call::filter_read()) {
                return $status if $status < 0;
                if (/^__(?:END|DATA)__\r?$/) {
                    $end = $_;
                    last;
                }
                $data .= $_;
                $_ = '';
            }
            $_ = $data;
            my @my_subs;
            s[^(sub\s+\w+\s+\{)(.*\n)]
             [${1}my \$self = shift;$2]gm;
            s[^(sub\s+\w+)\s*\(\s*\)(\s+\{.*\n)]
             [${1}${2}]gm;
            s[^my\s+sub\s+(\w+)(\s+\{)(.*)((?s:.*?\n))\}\n]
             [push @my_subs, $1; "\$$1 = sub$2my \$self = shift;$3$4\};\n"]gem;
            my $preclare = '';
            if (@my_subs) {
                $preclare = join ',', map "\$$_", @my_subs;
                $preclare = "my($preclare);";
            }
            $_ = "use strict;use warnings;$preclare${_};1;\n$end";
            if ($filter_dump) { print; exit }
            if ($filter_save) { $filter_result = $_; $_ = $filter_result; }
            $done = 1;
        }
    );
}

sub base {
    push @_, -base;
    goto &import;
}

sub all_my_bases {
    my $class = shift;

    return $bases_map->{$class} 
      if defined $bases_map->{$class};

    my @bases = ($class);
    no strict 'refs';
    for my $base_class (@{"${class}::ISA"}) {
        push @bases, @{all_my_bases($base_class)};
    }
    my $used = {};
    $bases_map->{$class} = [grep {not $used->{$_}++} @bases];
}

my %code = ( 
    sub_start => 
      "sub {\n",
    set_default => 
      "  \$_[0]->{%s} = %s\n    unless exists \$_[0]->{%s};\n",
    init =>
      "  return \$_[0]->{%s} = do { my \$self = \$_[0]; %s }\n" .
      "    unless \$#_ > 0 or defined \$_[0]->{%s};\n",
    weak_init =>
      "  return do {\n" .
      "    \$_[0]->{%s} = do { my \$self = \$_[0]; %s };\n" .
      "    Scalar::Util::weaken(\$_[0]->{%s}) if ref \$_[0]->{%s};\n" .
      "    \$_[0]->{%s};\n" .
      "  } unless \$#_ > 0 or defined \$_[0]->{%s};\n",
    return_if_get => 
      "  return \$_[0]->{%s} unless \$#_ > 0;\n",
    set => 
      "  \$_[0]->{%s} = \$_[1];\n",
    weaken => 
      "  Scalar::Util::weaken(\$_[0]->{%s}) if ref \$_[0]->{%s};\n",