function enumerated() {
	// NOTE: the following should match the C `diagonal_types.h` enumeration!!!!
	return {
		// Elements along a diagonal are not all equal to one:
		'non-unit': 131,

		// Elements along a diagonal are all equal to one:
		'unit': 132
	};
}
Returns an object mapping supported diagonal types to integer values for purposes of C inter-operation.

## Notes

-   Downstream consumers of this mapping should **not** rely on specific integer values (e.g., `unit == 132`). Instead, the object should be used in an opaque manner.
-   The main purpose of this function is JavaScript and C inter-operation of array objects.

@returns {Object} object mapping supported types to integer values

@example
var table = enumerated();
// returns <Object>