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/databinding/UpdateValueStrategy.java
if (converter == null) {
				IConverter converter = createConverter(sourceType,
						destinationType);
				defaultedConverter = (converter != null);
				setConverter(converter);
			}
			if (afterGetValidator == null) {
				afterGetValidator = createValidator(sourceType, destinationType);
			}
		}
		if (converter != null) {
			if (sourceType != null) {
				checkAssignable(converter.getFromType(), sourceType,
						"converter does not convert from type " + sourceType); 
			}
			if (destinationType != null) {
				checkAssignable(converter.getToType(), destinationType,
						"converter does not convert to type " + destinationType); 
			}
		}
	}
	private IValidator findValidator(Object fromType, Object toType) {
		IValidator result = null;
		
		
		if (defaultedConverter) {
			if (String.class.equals(fromType)) {
				result = (IValidator) validatorsByConverter.get(converter);
				if (result == null) {