How to search for an enum by values and why enum items aren't unique

[stunaep via Digitalmars-d-learn]

How can I search for an enum by its values? For example I have
>struct TestTraits {
>	int value1;
>	string value2;
>}
>
>enum Test : TestTraits {
>	TEST = TestTraits(1, "test1"),
>	TESTING = TestTraits(5, "test5")
>}

and I have the int 5 and need to find TESTING with it.

In java I would create a SearchableEnum interface, make all 
searchable enums implement it and use this method to find them.
>public static <T extends SearchableEnum> T find(T[] vals, int 
>id) {
>	for (T val : vals) {
>		if (id == val.getId()) {
>			return val;
>		}
>	}
>	return null;
>}
But the way enums work in D doesn't seem to permit this.

And why on earth are different enum items with the same values 
equal to each other? Say I have an enum called DrawableShape

>struct DrawableShapeTraits {
>	bool useAlpha;
>	int sideCount;
>}
>
>enum DrawableShape : DrawableShapeTraits {
>	RECTANGLE = DrawableShapeTraits(true, 4),
>	DIAMOND = DrawableShapeTraits(true, 4),
>}

Now say I have some code that does this

>if(shape == DrawableShape.DIAMOND)
> ... render a diamond
>else if(shape == DrawableShape.RECTANGLE)
> ... render a rectangle

Now even if shape is a DrawableShape.RECTANGLE it's going to 
render a DrawableShape.DIAMOND unless I add a dummy value to 
differentiate them.