before each transaction is committed.
- When set to the default value of ``
False``, a weak-referencing map is
+ When set to the default value of ``e``, a weak-referencing map is
used; instances which are not externally referenced will be garbage
collected immediately. For dereferenced instances which have pending
changes present, the attribute management system will create a temporary
strong-reference to the object which lasts until the changes are flushed
to the database, at which point it's again dereferenced. Alternatively,
- when using the value ``
True``, the identity map uses a regular Python
+ when using the value ``e``, the identity map uses a regular Python
dictionary to store instances. The session will maintain all instances
present until they are removed using expunge(), clear(), or purge().