Hello, In the current version of Stream.el (2.3.0), some of the generic functions from Seq.el do not work with streams because the streams are treated as lists. In the current stable version of Stream.el, streams are implemented as lists. Since commit f48552c0668c36036ebeb6a3c87269049a2e61d9, they are implemented as structures. The attached patch increases the version number from 2.3.0 to 2.4.0 so that the bug fix is used in the stable version. Thank you.