A class containing utility functions for data.
		val -- A single precision floating point value.
		Returns a half precision floating point value from the given single precision floating point value.
		
		val -- A half precision floating point value.
		Returns a single precision floating point value from the given half precision floating point value.
		
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]