Make package-install accept a string as well

* lisp/emacs-lisp/package.el (package-install): Allow passing a string
instead of a symbol.  (Bug#72160)
(package-upgrade): Improve docstring.

* test/lisp/emacs-lisp/package-tests.el
(package-test-install-single-from-archive/string-type): New test.

1 files changed, 7 insertions, 0 deletions

diff --git a/test/lisp/emacs-lisp/package-tests.el b/test/lisp/emacs-lisp/package-tests.el
index d8e260319bd..ed778049dcb 100644
--- a/test/lisp/emacs-lisp/package-tests.el
+++ b/test/lisp/emacs-lisp/package-tests.el
@@ -450,6 +450,13 @@ but with a different end of line convention (bug#48137)."
     (package-refresh-contents)
     (package-install 'simple-single)))
 
+(ert-deftest package-test-install-single-from-archive/string-type ()
+  "Install a single package from a package archive, using string argument."
+  (with-package-test ()
+    (package-initialize)
+    (package-refresh-contents)
+    (package-install "simple-single")))
+
 (ert-deftest package-test-install-prioritized ()
   "Install a lower version from a higher-prioritized archive."
   (with-package-test ()