The End of Transmission (EOT) mark tells any reader that it can stop reading.
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EOT tells the data reader that data is done.
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EOT has no effect on the output content.
Example of a unit "abc" then EOT then extra data "xxx" that is ignored.
abc␞␄xxx
EOT can be useful for a variety of use cases:
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Streaming data, such as to signal that the reader can close a connection.
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Appending data, such as USV content, then extra information such as comments.
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Attaching data, such as a USV spreadsheet that has MIME attachments.