* simple.el (kill-region): Change interactive spec to signal an
error if the buffer is read-only, and remove the code to do a copy-region-as-kill if the buffer is read-only. * simple.el (set-mark-command): Clarify doc string. * simple.el (prefix-arg-internal): Don't apply string-to-char to get the first element of the key sequence - it might be a vector.
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