diff --git a/autoload/maktaba/value.vim b/autoload/maktaba/value.vim
index 0f0035f..e72a7ec 100644
--- a/autoload/maktaba/value.vim
+++ b/autoload/maktaba/value.vim
@@ -73,7 +73,7 @@ endfunction
 ""
 " Whether {value} is in {list}.
 " @throws BadValue if {list} is not a list.
-function! maktaba#value#IsIn(Value, list)
+function! maktaba#value#IsIn(Value, list) abort
   return index(maktaba#ensure#IsList(a:list), a:Value) >= 0
 endfunction
 
@@ -101,23 +101,38 @@ endfunction
 
 ""
 " Returns the type of {value} as a string.
-" One of "number", "string", "funcref", "list", "dictionary", or "float".
+" One of "number", "string", "funcref", "list", "dictionary", "float",
+" "boolean", "null", "none", "job", or "channel".
 " See also |type()|.
 function! maktaba#value#TypeName(Value) abort
   let l:type = type(a:Value)
   if l:type == 0
-    return "number"
+    return 'number'
   elseif l:type == 1
-    return "string"
+    return 'string'
   elseif l:type == 2
-    return "funcref"
+    return 'funcref'
   elseif l:type == 3
-    return "list"
+    return 'list'
   elseif l:type == 4
-    return "dictionary"
+    return 'dictionary'
   elseif l:type == 5
-    return "float"
+    return 'float'
+  elseif l:type == 6
+    return 'boolean'
+  elseif l:type == 7
+    " None (v:null or v:none) in Vim.
+    " Null (v:null) in Neovim.
+    if exists('v:none') && a:Value is v:none
+      return 'none'
+    endif
+    return 'null'
+  elseif l:type == 8
+    return 'job'
+  elseif l:type == 9
+    return 'channel'
   endif
+  return printf('unknown type (%d)', l:type)
 endfunction