donkey 1.17.1 — a key taken out of Normal state no longer reaches the major mode

A bug fix release. A key in Normal state is now DONKEY's, one you
bound, or nothing: taking one of DONKEY's keys away with
keymap-unset used to hand it to whatever the major mode put there,
where it could type or run the mode's own command. The tutor stops
erasing itself on the first u, and shows its keys, its states and
the lines to practice on in colors of their own.

Fixed -- you will notice these

• keymap-unset on a key of donkey-normal-mode-map: the key used to
  fall through to the major mode, with or without REMOVE. Measured
  over sixteen stock modes with every printable key, RET and DEL
  unset: / typed in html-mode and nxml-mode, " typed in
  texinfo-mode and latex-mode, and RET and DEL edited in all
  sixteen. Now every printable key, SPC, RET and the delete keys
  do nothing once taken away. TAB and every key Normal state never
  bound -- C-x, C-c, M-x, the arrows -- reach Emacs as before.
  The README gave the fall-through as the way to give a key back to
  the buffer; its own example, ;, gave nothing back in any stock
  mode, and the section is now "Taking a key away".
• g, m, r, z and SPC: a sequence a major or minor mode bound
  under one of those keys ran in Normal state, merged in under
  DONKEY's own. Only DONKEY's keys and yours answer there now.
• u in the tutor: in a tutor just opened, one u emptied the
  buffer, because the lesson itself was on the undo list. Undo now
  stops at the lesson as it opened.
• The tutor wrote RET and SPC as plain text beside keys drawn as
  keys. They, the C-u of a count, and Backspace and Delete, which it
  now names DEL and <delete> as Emacs does, are drawn as keys too.

Changed -- you will notice these

• The tutor colors the names of the states -- NORMAL, INSERT, SUPPORT,
  and the modeline's DONKEY[N], DONKEY[I], DONKEY[S] and DONKEY[E] --
  in the face donkey-tutor-state, and marks each line to practice on
  with ---->, four dashes where there were three, in
  donkey-tutor-arrow. The faces inherit font-lock-keyword-face and
  font-lock-builtin-face; customize either to change it. A font with
  arrow ligatures, Cascadia Code among them, draws ---> as a double
  dash and a short arrow, and ----> as one arrow.

Upgrading

Nothing to do, unless you took a key out of donkey-normal-mode-map to
reach the major mode's command in Normal state: that key now does
nothing. Bind the command to the key in donkey-normal-mode-map, or,
for one mode only, remap DONKEY's command in that mode's own map, as
the README's "If a Key Is Not Doing What You Want" shows. A tutor
buffer already open keeps its old text until you kill it.