BetterJapanese/kuebiko — pull request #2 by Vorzard (2014-05-24 08:29:17+00:00)
Title: Deploy SystemException, UserException

Unchecked base exceptions.

I propose to adopt an exception model, where an exception is treated as either a **contingency** (a checked exception), a **user error** (an unchecked `UserException`) or a **fault** (an unchecked `SystemException`).

See for details.