libdexx-java 0.7-2 (ppc64el binary) in ubuntu mantic

 Dexx Collections are a port of Scala's immutable, persistent collection
 classes to pure Java. Persistent in the context of functional data structures
 means the data structure preserves the previous version of itself when
 modified. This means any reference to a collection is effectively immutable.
 However, modifications can be made by returning a new version of the data
 structure, leaving the original structure unchanged.