Default implementation of the {@link SubjectContext} interface. Note that the getters and setters are notsimple pass-through methods to an underlying attribute; the getters will employ numerous heuristics to acquire their data attribute as best as possible (for example, if {@link #getPrincipals} is invoked, if the principals aren'tin the backing map, it might check to see if there is a subject or session in the map and attempt to acquire the principals from those objects).
@since 1.0
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