Improvements
- Rename functions RSA_SIGN and RSA_VERIFY (#6806)
- Add session time zone to system context (#6786)
- More efficient implementation of SUBSTRING for UTF8 character set (#6769)
- Add ability for a replication plug-in to refuse attachment (#6767)
- Freeing a statement using DSQL_drop or DSQL_unprepare should send free packet immediately (#6748)
- Provide time zone ID constants in public headers (#6715)
- RDB$GET_TRANSACTION_CN should work the same way in Super and Classic (#6253)
More details can be found in the CHANGELOG.