function enumerated() {
	// NOTE: the following should match the C `index_modes.h` enumeration!!!!
	return {
		'throw': 1,
		'clamp': 2,
		'wrap': 3,
		'normalize': 4
	};
}
Returns an object mapping supported index modes to integer values for purposes of C inter-operation.

## Notes

-   Downstream consumers of this mapping should **not** rely on specific integer values (e.g., `throw == 1`). Instead, the object should be used in an opaque manner.
-   The main purpose of this function is JavaScript and C inter-operation of ndarray objects.

@returns {Object} object mapping supported index modes to integer values

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