diff --git a/autoload/plug.vim b/autoload/plug.vim
index 7945e8d..9165956 100644
--- a/autoload/plug.vim
+++ b/autoload/plug.vim
@@ -225,6 +225,7 @@ function! plug#end()
           endif
           call add(s:triggers[name].map, cmd)
         elseif cmd =~# '^[A-Z]'
+          let cmd = substitute(cmd, '!*$', '', '')
           if exists(':'.cmd) != 2
             call s:assoc(lod.cmd, cmd, name)
           endif
@@ -251,7 +252,7 @@ function! plug#end()
 
   for [cmd, names] in items(lod.cmd)
     execute printf(
-    \ 'command! -nargs=* -range -bang %s call s:lod_cmd(%s, "<bang>", <line1>, <line2>, <q-args>, %s)',
+    \ 'command! -nargs=* -range -bang -complete=file %s call s:lod_cmd(%s, "<bang>", <line1>, <line2>, <q-args>, %s)',
     \ cmd, string(cmd), string(names))
   endfor
 
@@ -750,7 +751,7 @@ function! s:prepare(...)
   for k in ['<cr>', 'L', 'o', 'X', 'd', 'dd']
     execute 'silent! unmap <buffer>' k
   endfor
-  setlocal buftype=nofile bufhidden=wipe nobuflisted nolist noswapfile nowrap cursorline modifiable
+  setlocal buftype=nofile bufhidden=wipe nobuflisted nolist noswapfile nowrap cursorline modifiable nospell
   setf vim-plug
   if exists('g:syntax_on')
     call s:syntax()
@@ -954,7 +955,7 @@ function! s:update_impl(pull, force, args) abort
 
   let use_job = s:nvim || s:vim8
   let python = (has('python') || has('python3')) && !use_job
-  let ruby = has('ruby') && !use_job && (v:version >= 703 || v:version == 702 && has('patch374')) && !(s:is_win && has('gui_running')) && s:check_ruby()
+  let ruby = has('ruby') && !use_job && (v:version >= 703 || v:version == 702 && has('patch374')) && !(s:is_win && has('gui_running')) && threads > 1 && s:check_ruby()
 
   let s:update = {
     \ 'start':   reltime(),
@@ -1152,7 +1153,7 @@ function! s:job_cb(fn, job, ch, data)
   call call(a:fn, [a:job, a:data])
 endfunction
 
-function! s:nvim_cb(job_id, data, event) abort
+function! s:nvim_cb(job_id, data, event) dict abort
   return a:event == 'stdout' ?
     \ s:job_cb('s:job_out_cb',  self, 0, join(a:data, "\n")) :
     \ s:job_cb('s:job_exit_cb', self, 0, a:data)
@@ -2012,10 +2013,21 @@ function! s:git_validate(spec, check_branch)
               \ branch, a:spec.branch)
       endif
       if empty(err)
-        let commits = len(s:lines(s:system(printf('git rev-list origin/%s..HEAD', a:spec.branch), a:spec.dir)))
-        if !v:shell_error && commits
-          let err = join([printf('Diverged from origin/%s by %d commit(s).', a:spec.branch, commits),
-                        \ 'Reinstall after PlugClean.'], "\n")
+        let [ahead, behind] = split(s:lastline(s:system(printf(
+              \ 'git rev-list --count --left-right HEAD...origin/%s',
+              \ a:spec.branch), a:spec.dir)), '\t')
+        if !v:shell_error && ahead
+          if behind
+            " Only mention PlugClean if diverged, otherwise it's likely to be
+            " pushable (and probably not that messed up).
+            let err = printf(
+                  \ "Diverged from origin/%s (%d commit(s) ahead and %d commit(s) behind!\n"
+                  \ .'Backup local changes and run PlugClean and PlugUpdate to reinstall it.', a:spec.branch, ahead, behind)
+          else
+            let err = printf("Ahead of origin/%s by %d commit(s).\n"
+                  \ .'Cannot update until local changes are pushed.',
+                  \ a:spec.branch, ahead)
+          endif
         endif
       endif
     endif