document file: format version 3HEADmaster

The document file's first line names its format; each record's first
byte its kind. A version that doesn't know a kind refuses the file, as
it does a format it doesn't know. With the Closed and Opened records,
the format is continuum-document/3, so a version knowing only 2 refuses
a file it can't read by its first line. Files of 2 are read as of 3:
the same records, Closed and Opened where a version knowing them wrote
them.

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