I have created another pull request with an implementation for #upToAll: for ZnCharacterReadStream: https://github.com/pharo-project/pharo/pull/634 Here is the case: https://pharo.fogbugz.com/f/cases/20905 CI checks are in progress. Does that make it the first contribution in 2018? ;-) Let me know what you think. Happy New Year Bernhard