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Fixes a derived-data bug caused by a tooling error which had set the idna2008derived status of U+19DA to be PVALID.
In IdnaMappingTable.txt U+19DA has an IDNA2008 Status of XV8: https://www.unicode.org/reports/tr46/#Table_Data_File_Fields
“XV8 is present when the character is excluded by IDNA2008 for the current version of Unicode.”
Therefore, in the idna2008derived files it needs to be DISALLOWED.
All files copied verbatim today from https://www.unicode.org/Public/idna/idna2008derived/
except for restoring the template placeholders in the ReadMe.