Fix rounding for half.
Fix rounding for half.

RobertoMalatesta/envisionjs,bigspotteddog/envisionjs,RobertoMalatesta/envisionjs,RobertoMalatesta/envisionjs,HumbleSoftware/envisionjs,notepad104/envisionjs,bigspotteddog/envisionjs,notepad104/envisionjs,notepad104/envisionjs,HumbleSoftware/envisionjs