History for SecurityContext
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The security context is an object used internally to the security
machinery. It captures data about the current security context.
Attributes:
stack -- The security context stack expressed as
a sequence ordered from bottom to top.
This should not be mutated. The bottom of the stack
is element 0, the top is element -1. The stack may
be empty.
An element will either be an ExecutableObject or a tuple consisting
of an ExecutableObject and a SecurityPolicy.
user -- The AUTHENTICATED_USER