Constant lmdb_zero::error::MISMATCH

pub const MISMATCH: c_int = REOPENED + 1

An attempt was made to use two items together which cannot be used together.

For example, trying to use a cursor from one transaction to access data in another.

This is not a standard LMDB error code, and arises due to some functions needing to take redundant inputs to make borrow checking work.