Although the default Char type is now mapped to WideChar, it is worth noticing that Delphi defines also a 4-byte character type, UCS4Char, defined in the System unit as: type
UCS4Char = type LongWord;
While this type definition and the corresponding one for UCS4String (defined as an array of UCS4Char) were already in Delphi 2007, the relevance of the UCS4Char data type in Delphi 2009 comes from the fact it is now used significantly in several RTL routines, including those of the new Character unit discussed next.
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