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What order guarantees are provided for calls to ServiceListener and ServiceTracker?

I am trying to understand what guarantees are provided for official events.

The OSGi specification says that ServiceEvents are synchronous, I used this to mean that the ServiceListener will not receive a serviceChanged () call with UNREGISTERING ServiceEvent until the serviceChanged () call with REGISTERED ServiceEvent ends. Is it correct?

I also looked at the source for ServiceTracker. He seems to be trying to deal with a situation where these two calls to serviceChanged () overlap. Is it possible?

Are there any similar guarantees when calling ServiceTrackerCustomizer?

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