Bug 183890 [DataBinding] Default converter for numbers to numbers
We don't currently default converters for converting between numbers (e.g. int to double, long to int, etc.).
bundles/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/conversion/StringToNumberParser.java
Number number;
		ParsePosition position;
		/**
		 * The number as a result of the conversion. <code>null</code> if the
		 * value could not be converted or if the type is not a primitive and
		 * the value was an empty string.
		 * 
		 * @return number
		 */
		public Number getNumber() {
			return number;
		}
		/**
		 * ParsePosition if an error occurred while parsing. <code>null</code>
		 * if no error occurred.
		 * 
		 * @return parse position
		 */
		public ParsePosition getPosition() {
			return position;
		}
	}
	/**
	 * Formats an appropriate message for a parsing error.
	 * 
	 * @param value