RequestCondition types keep individual expression types (e.g. the
discrete header or param expressions) package private. Although the
implementation of these types should remain private, there is no
reason not to provide access to the underlying expression data --
e.g. for creating a REST endpoint documentation tool, or if you
want to know which of the "consumes"/"produces" media types
are negated.
This change ensures that all RequestCondition types have a public
getter that makes available the basic expression data.
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