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use strict;
use UNIVERSAL 'isa';
...
my $type_search = build_deep_sub( init => 'my $type = shift;', map => 
+'grep isa( $_, $type ), ', guard => 'ref($_)' );

my @loggers = $type_search->( 'Log', $target );

  *{'deep_walk'} = build_deep_sub();
  *{'deep_map'} = build_deep_sub( init => 'my $test = shift;', map => 
+'map $test->($_),' );
  *{'deep_grep'} = build_deep_sub( init => 'my $test = shift;', map =>
+ 'grep $test->($_),' );
  *{'deep_grep_refs'} = build_deep_sub( init => 'my $test = shift;', m
+ap => 'grep $test->($_),', guard => 'ref($_)' );
  *{'deep_grep_type'} = build_deep_sub( init => 'my $type = shift;', m
+ap => 'grep isa( $_, $type ), ', guard => 'ref($_)' );