Internally, the dict is attached to a threading local object and all access is passed through to the thread-safe object.

This difference means that the object must be initialized per-thread with a _clear() call before the object can be used, and it should be _clear()'ed every request call.

The RequestLocal object also support attribute assignment, which is then internally stored as if they used item assignment. Attribute get is also supported, and is used to 'get' the name requested. Unlike normal attribute access, this will return an empty string if the attribute does not exist.