I am aware that the question is (almost) a duplicate of the following question #21991, which has been posted back in 2012. But that question is NOT related to Drupal 8, where UUID is in core.
The Drupal 8 Core Module Documentation does not list UUID.
I wonder if I could leverage Drupal 8's core UUID module to migrate and map relational data imported from a different environment, which has unique keys generated by Firebase.
It has been kindly pointed out that UUID is not a module.
It seems to make UUID records per default for entities (aka nodes) and apparently can be used to map entity references.
Can I make use of this when I introduce external data, that already has unique IDs? So I have the "node" IDs and can map with the UUIDs?
Update based on further comments:
The goal is to use UUID with entities and the REST module. Respectively, it seems sensible to do so when importing external relational data, that already has unique IDs.
I just try to understand how UUID works, what it can do and what not, how I can generate and validate UUID's, what I need to be aware of, if I introduce external ID's.