+ $filter = {
+ 'price:number::lt' => '2,30',
+ 'closed => '1',
+ }
+
+and parse it with
+
+ parse_filter($filter, launder_to => $laundered_filter = { })
+
+the original filter will be unchanged, and C<$laundered_filter> will end up
+like this:
+
+ $filter = {
+ 'price_number__lt' => '2,30',
+ 'closed => '1',
+ }