CAST behaving differently in version 2.5
----------------------------------------

                 Key: CORE-4420
                 URL: http://tracker.firebirdsql.org/browse/CORE-4420
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 2.5.2
         Environment: Linux server
            Reporter: Rodrigo Gonçalves


The following commands give different results between versions 2.1.1 and 2.5.2, 
both running in Linux systems:

Version 2.1.1:

SQL> SELECT rdb$get_context('SYSTEM', 'ENGINE_VERSION') from rdb$database;

RDB$GET_CONTEXT                                                                 
                                                                          
===============================================================================
2.1.1                                                                           
                                                                          

SQL> select round(cast(260.9550000000000 as double precision), 2) from 
rdb$database;

                  ROUND
=======================
      260.9500000000000


Version 2.5.2:

SQL> SELECT rdb$get_context('SYSTEM', 'ENGINE_VERSION') from rdb$database;

RDB$GET_CONTEXT                                                                 
                                                                          
===============================================================================
2.5.2                                                                           
                                                                          

SQL> select round(cast(260.9550000000000 as double precision), 2) from 
rdb$database;

                  ROUND
=======================
      260.9600000000000


We've looked through the release notes and bugtracker, but couldn't find any 
change related to it.

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