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  1. or download this
    field_filters => { 
     my_filter => sub { my $value = shift; $value =~ s/foo/bar; return
+ $value; },
 },
  2. or download this
    filters => [ sub { my $value = shift; $value =~ s/foo/bar; return $val
+ue; } ],
  3. or download this
    sub some_filter_sub {
  my $value = shift;
...
#     my_filter => \&some_filter_sub, 
# },
 filters => [ my_filter => \&some_filter_sub ],