* emacs-lisp/package.el (package-unpack): Remove no-op.
(package--builtins, package--dir): Doc fix. (package-activate-1, package-activate, package-install) (package-compute-transaction): Fix error message. (package-delete): Use delete-directory. Omit system packages. (package-initialize): Set package-alist to nil first. (package-menu-mark-delete, package-menu-mark-install): Don't add symbols that are inconsistent with the package state. (package-menu-execute): Perform deletions and installations as single batch operations.
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