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Presently, we use a tuple to attach a dict containing annotations (comments and compile-time conditionals) to a tree node. This is undesirable because dicts are difficult to strongly type; promoting it to a real class allows us to name the values and types of the annotations we are expecting. In terms of typing, the Annotated<T> type serves as a generic container where the annotated node's type is preserved, allowing for greater specificity than we'd be able to provide without a generic. Signed-off-by: John Snow <jsnow@redhat.com> Message-Id: <20210216021809.134886-11-jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>