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Re:Show HN: Gun v0.1.0 – The Easiest Database Ever by ahelwer on Thursday February 19, 2015 @07:01PM (#9078055)
What is a boundary function?
Re:Show HN: Gun v0.1.0 – The Easiest Database Ever by marknadal on Thursday February 19, 2015 @07:13PM (#9078107)
This person (in the comments below, please upvote him), and my reply, best addresses the most important questions (including the boundary function):

https://news.ycombinator.com/item?id=9077969