from preamble:

"Change Set:		FileExistsFix
Date:			24 October 2001
Author:			Leandro Caniglia

If you try to overwrite a file that already existed (by sending the
message #newFileNamed:), then a StandardFileStream will be created. This
behavior is observed even when the receiver of the original message were
a subclass of SFS. For instance, trying to overwrite a CrLfFileStream
will result in a StandardFileStream, and not in a CrLfFileStream."!
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