I've used the Java 8 primitive iterators because this interface is public and did not want to expose fastutil classes. However, this API is internal, so we might use fastutil as well. Unfortunately, Java 8 only introduced the primitive iterators but non of the other primitive implementations that fastutil offers (primitive lists, sets, maps etc.). So, I don't think we can drop fastutil. Do you think it is better to use the fastutil primitive iterators here?
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