SE-0559: Add `bidiClass` to `Unicode.Scalar.Properties`

Hello, Swift community! The review of SE-0559: Add bidiClass to Unicode.Scalar.Properties begins now and runs through November 4, 2026. Reviews are an important part of the Swift evolution process. All review feedback should be either on this forum thread or, if you would like to keep your feedback private, directly to me as the review manager by email or DM. When contacting the review manager directly, please put "SE-0559" in the subject line. What goes into a review? The goal of the review ...