Elisp surprise of the day: (setq 0x123 42) is legal. #emacs
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A pleasant surprise: updating the direct dependencies in difftastic has reduced the total transitive dependencies. I wasn't expecting that.
Today I learnt that null bytes are valid in UTF-8 and ASCII strings!
It was a surprise -- \0 doesn't feel like text -- but it'd be even more awkward when using C-style strings.