* lisp/subr.el (buffer-match-p--past-warnings): New var.
(buffer-match-p): Use it. Replace `&optional arg` with `&rest args`.
(match-buffers): Replace `&optional arg` with `&rest args`.
* lisp/window.el (display-buffer-alist): Fix out of date docstring.
* doc/lispref/buffers.texi (Buffer List): Document new calling convention.
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