*: Move some dictionary functions to typval.h and use char*

Also fixes buffer reusage in setmatches() and complete().

test/functional/viml/completion_spec.lua

@@ -3,6 +3,7 @@ local Screen = require('test.functional.ui.screen')
 local clear, feed = helpers.clear, helpers.feed
 local eval, eq, neq = helpers.eval, helpers.eq, helpers.neq
 local execute, source, expect = helpers.execute, helpers.source, helpers.expect
+local meths = helpers.meths
 
 if helpers.pending_win32(pending) then return end
 
@@ -814,6 +815,41 @@ describe('completion', function()
     end)
   end)
 
+  describe('with numeric items', function()
+    before_each(function()
+      source([[
+        function! TestComplete() abort
+          call complete(1, g:_complist)
+          return ''
+        endfunction
+      ]])
+      meths.set_option('completeopt', 'menuone,noselect')
+      meths.set_var('_complist', {{
+        word=0,
+        abbr=1,
+        menu=2,
+        kind=3,
+        info=4,
+        icase=5,
+        dup=6,
+        empty=7,
+      }})
+    end)
+
+    it('shows correct variant as word', function()
+      feed('i<C-r>=TestComplete()<CR>')
+      screen:expect([[
+        ^                                                            |
+        {1:1 3 2          }{0:                                             }|
+        {0:~                                                           }|
+        {0:~                                                           }|
+        {0:~                                                           }|
+        {0:~                                                           }|
+        {0:~                                                           }|
+        {3:-- INSERT --}                                                |
+      ]])
+    end)
+  end)
 end)
 
 describe('External completion popupmenu', function()