• replacing floating point by integer arithmetic, in glue calculations;
• introducing hyphenation classes (with a corresponding change to patgen);
• implenting demerits for more than 2 consecutive hyphens;
• providing ‘nestable’ and ‘under’ math accents; a primitive to switch to ‘cramped’ styles; provides generalised radicals with a left- and right-delimiter; implementation work for using the hz algorithm;
• marginal tokens for hanging punctuation and hyphens.

The author is Matthias Clasen.