XDCR Filtering Expressions: Array Slicing, Negative Array Indexing, Arrays with * Operator aren't valid.

On https://docs.couchbase.com/server/current/xdcr-reference/xdcr-filtering-expressions.html#xdcr-selection-operators-comparison-with-sql , it states that 
The Element Selection Operator is also used in SQL++ with additional functionality: negative indexing of arrays and the * operator are supported. SQL++ also provides array slicing that allows the building of sub-slices of arrays. For information, see the SQL++ page for Nested Operators and Expressions.

However, when testing these filtering expressions, XDCR doesn't seem to like it at all. Have confirmed with XDCR team and Patrick Varley that it looks like a docs issue.