In all the documentations on keys for entities I've seen. It always
talk about how the key has numeric id
which is auto generated by the datastore, or a string entity name
which the app can assign.

but you can in fact create your own key and pass numeric instead of a string.

The only reason I can think of this should be avoided is if you also
have the datastore
auto generate the id, it's not guaranteed to avoid using ones you've assigned.

Are there any other reasons?

Thanks

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