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An interface to a context stack for the API to run against.
current: Returns the current context (one at the top of the context stack).
install( *args, **kwds )
A context manager that temporarily installs a new context on the stack.
The installed context is placed at the top on the stack while in the context manager's scope, and remove from the stack upon exiting the scope. This method should only be used by the implementation code, and by the unit tests for dependency injection.
ctx: The context to temporarily install at the top of the context stack, an instance of
The installed context.
ctxis not a valid instance of