Version 2.0f includes fixes for most reproducible bugs discovered to date. Most of the bugs fixed have been minor/obscure issues, many of which were also present in version 1.6 or were in the new features added in 2.0. To determine if you need a patch release, please consult the What's new list below or the fixed bug list.
h(x) = 0, for x < 0, 1/2 for x = 0, 1 for x > 0