0.51.0 is a bug fix release that fixes jump cd not respecting jump settings --space. By default we wanna treat j dev soc web as j dev/soc/web. Due to a bug in jump cd, j jump soc web was treated as j jumpsocweb.
We have settings in jump. You set them with jump settings. I once said that "I don't want jump to have settings". I cave in. @StanAngeloff was switching from z and z joins terms separated by spaces and I introduce jump settings --spaces=ignore for him. Nepotism at it's finest!