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d40d564c5a
It previously only supported NFKC, for use by SASLprep. This expands the API to offer the choice of all four normalization forms. Right now, there are no internal users of the forms other than NFKC. Reviewed-by: Daniel Verite <daniel@manitou-mail.org> Reviewed-by: Andreas Karlsson <andreas@proxel.se> Discussion: https://www.postgresql.org/message-id/flat/c1909f27-c269-2ed9-12f8-3ab72c8caf7a@2ndquadrant.com