Commits
Ward Fisher committed d10688a6fbd
Issue identified, see https://github.com/Unidata/netcdf-c/issues/159 for specifics. Also see http://stackoverflow.com/questions/10541200/is-the-behaviour-of-casting-a-negative-double-to-unsigned-int-defined-in-the-c-s for some background info that lead me to the fix.