emenegro/pull-to-refresh — pull request #1 by sangregoriopaolo (2013-01-09 11:06:11+00:00)
Title: Mark constant as static to avoid duplicate symbol when using both MNMPullToRefresh and MNMBottomPullToRefresh modules

I just used both these libraries on one of my projects, and the compiler told me that kAnimationDuration was a duplicated symbol.
By setting it as static its scope is restricted to that file only.