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This patch consolidates the notions of an optional parameter and a default parameter. An optional parameter is a parameter equal to its default value, which for a "purely optional" parameter is its "null" value. This allows the existing `comparator` and `defaultValue` fields to be used enabled more complex "optional" parameters, such as empty arrays. Depends on D133812 Reviewed By: rriddle Differential Revision: https://reviews.llvm.org/D133816