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Re: (ITS#7238) Multiple txns in same thread break mdb

 Related doc bug:

 I expect it should be "only one thread at a time".  I doubt
 it's about pinning some operation to a particular thread:-)

 However, maybe it should rather be something like "No other
 transaction doing mdb_open() may exist at the same time, nor
 a write transaction (since that also updates the databases),
 nor may such a transaction exist during mdb_close()" ?

 I note mdb_drop() also updates the databases and can
 likely not coexist with the others, but that's covered by
 mentioning write txns.

 Regarding mdb_drop(), while I'm at it:
 	@brief Delete a database and/or free all its pages.
 	@param[in] del non-zero to delete the DB from
 	the environment, otherwise just free its pages.
 Free which pages?  In the DB, or some malloced ones?  I
 expect it should be "delete a database or empty its contents",
 and "del non-zero ... otherwise just empty the database."