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How to specify composite types in signal handlers

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I’m writing a signal handler for [`signal-cli`’s D-Bus service](https://github.com/AsamK/signal-cli/wiki/DBus-service); the `MessageReceived` signal has two arrays in its type signature `("x" "s" "ay" "s" "as")`. How should I specify a signal...

It is difficult to reproduce, but this code will often (not always) result in a LENGTH-ERROR: ```lisp (xlib/dpms:dpms-enable *display*) (xlib/dpms:dpms-set-timeouts *display* 900 1200 1800) (xlib:display-finish-output *display*) (sb-ext:process-wait (sb-ext:run-program "/usr/bin/slock" nil)...