Emacs core is dropping Misc objects! Everything that isn't a basic type (list, strings, buffer etc) will now be a pseudovector:
miniblog.
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A really nice explanation of lisp semantics, using userland code!
For example, you can define let in terms of let* and vice versa.
misc.el contains a number of handy Emacs commands. For example, copy-from-above-command duplicates the non-blank line above point.
Learnt today that core Emacs contains a misc.el. Crikey! It's small at least.