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After e9931bfb751, the locale argument of SB_lower_char() is never NULL, so the branch that deals with NULL can be removed (similar to how e9931bfb751 for example removed those branches in str_tolower()). Reviewed-by: Jeff Davis <pgsql@j-davis.com> Discussion: https://www.postgresql.org/message-id/4f562d84-87f4-44dc-8946-01d6c437936f@eisentraut.org