As part of r884063 (part of Growth-Positive-Reinforcement, an ongoing Growth-Team project), being able to do ConvertibleTimestamp::time()->sub(...) would come useful (added in 09b22e4600). Let's do a new release of the library, which would include the following patches:
- R1985:09b22e4600e9: Add add(), sub() methods for date interval arithmetic
- R1985:bbba1bc9ab46: setFakeTime: add $step parameter
- R1985:e7086c1f7d0a: Add microtime() function
- R1985:5697f07c2ff3: Fix documentation for ConvertibleTimestamp.php
as well as some require-dev bumps by libraryupgrader. AFAICS, there is no breaking change involved, merely new methods/new optional parameters => let's go for 4.1.0 as the new version.