First Draft of PostgreSQL 12 Release Notes

The many system tables with such columns will now display those columns with by default. Allow data type name to use non-C collations (Tom Lane, Daniel Vérité) It still uses the “C” collation by default, rather than defaulting to the database collation. Regular expression operations on data type name columns will now use the “C” collation; you will need to override the collation if you want to use locale-specific regular expression patterns, e.g., .

Source: www.postgresql.org