Concurrency properties are unclear about kv HOT 3 OPEN

The documentation can be more explicit about this.

#Accepted

from kv.

Document is pretty unclear about that atleast in BeginTranscation. It also doesn't any test and documentation reads it's safe to use in concurrent environment.
After looking at the code I can't see how it's possible for multiple goroutines in example a web service to work without using mutex locking before BeginTransaction and unlocking after commit or rollback.
Or am I missing something here?

from kv.

I have the same doubt, I see the source that there is no way to guarantee different transaction serializable writing. Maybe user must use a lock outer?

from kv.