Use given ID as a unique {@link EFeature#getID() EFeature ID} for given {@link EObject} instance.
@param eObject - a {@link EFeature} instance or a {@link EObject} containing {@link EFeature} compatible data.
@param eID - the {@link EObject} ID value.
@return same ID if unique, new unique ID otherwise.
@throws IllegalArgumentException If the factory does not create IDs for given {@link EObject}
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