* lisp/emacs-lisp/cl-macs.el (cl--transform-lambda): Optimize &aux.
Rework to avoid cl--do-arglist in more cases; add comments to explain what's going on. (cl--do-&aux): New function extracted from cl--do-arglist. (cl--do-arglist): Use it. * lisp/emacs-lisp/cl-generic.el: Add Version: header, for ELPA purposes.
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