A dir list even a few seconds old may not contain accurate information. Especially if the the file is ASCII because the file list contains the size of the file in binary and the mode needs to be switched to ASCII and issue a SIZE <filename>
SIZE is also used to determine if the still exists.
By not using SIZE you reduce the effectiveness of the file exist rules. We may consider an option to turn this off in future versions.
I don't think old posts are deleted but I could be wrong.
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