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-version 1.302, 2020/04/26 21:41:07
+version 1.303, 2020/06/22 18:00:30
 Line 83  are mere guesses, and some may be wrong.
 Line 83  are mere guesses, and some may be wrong.
 Line 83  are mere guesses, and some may be wrong.
    Jan Stary 20 Apr 2019 20:16:54 +0200
    loc *  exist ***  algo ***  size **  imp *
+ - mandoc replaces all ASCII control characters except tab and line feed
+   with '?' during input.  It would be better to replace them with
+   Unicode escapes in preconv_encode() or somewhere in the vicinity,
+   such that the already existing better replacement strings show
+   up in the output.  Emulating groff is not desirable: groff replaces
+x00, 0x0b, and 0x0d to 0x1f with the empty string (bad because
+   that's easy to overlook for the document author), 0x01 with '.'
+   (very confusing), and passes through 0x02 to 0x08, 0x0c, and 0x7f
+   raw (bad because that is insecure output).  Remember that 0x07 may
+   need special handling because it is sometimes used for certain
+   delimiters, so it may need handling *after* roff.c rather than before.
+   reminded by John Gardner 16 Jun 2020 14:26:28 +1000
+   loc **  exist **  algo **  size **  imp *
  --- missing mdoc features ----------------------------------------------
  - .Sh and .Ss should be parsed and partially callable, see groff_mdoc(7)