Question about LibLmdb MDB_GET_BOTH_RANGE and MDB_SET_RANGE

I am trying to figure out how these calls work. The SET_RANGE works as expected but I was expecting different behavior fro GET_BOTH_RANGE.

I have the following code in my spec file.

txn.put(db, "1", "1") txn.put(db, "1", "1.1") txn.put(db, "1", "1.2") txn.put(db, "1", "1.3") txn.put(db, "2", "2") txn.put(db, "2.1", "2.1") txn.put(db, "2.2", "2.2")

Then I do a seek like this

cur.find_ge(".") #this uses SET_RANGE cur.find_ge(".", "1.2") #this uses GET_BOTH_RANGE

The result of the first call is "1", "1" but the second call results in a MDB_NOTFOUND

Seems like I am missing something here.

Thanks.