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+title: $:/changenotes/5.4.0/#9595
+description: Easier avoidance of deduplication in filters
+release: 5.4.0
+tags: $:/tags/ChangeNote
+change-type: enhancement
+change-category: filters
+github-links: https://github.com/TiddlyWiki/TiddlyWiki5/pull/9595
+github-contributors: Jermolene
+
+Resolves a long-standing issue with filters where there has been no easy way to avoid deduplication of results during filter evaluation. There are two distinct new capabilities.
+
+First, there is a new filter pragma `::defaultprefix` that sets the default filter run prefix for the remainder of the filter expression. Filter pragmas are a new concept akin to wikitext pragmas, allowing special instructions to be embedded in filter expressions.
+
+The `::defaultprefix` pragma takes as its first parameter the desired default filter run prefix, followed by any number of filter operations to which it applies. The default prefix `all` can be used to disable deduplication for the subsequent operations (`or` is the default prefix that performs deduplication).
+
+For example:
+
+```
+::defaultprefix:all 1 2 2 1 4 +[join[ ]]
+```
+
+Returns `1 2 2 1 4`.
+
+Contrast to the result without the pragma which returns `2 1 4`:
+
+```
+1 2 2 1 4 +[join[ ]]
+```
+
+Second, there is a new parameter to the `subfilter` and `filter` operators to specify the default filter run prefix to use when the filter is evaluated. This overrides any default set with the `::defaultprefix` pragma.
+
+```
+[subfilter:all<my-subfilter>]
+```