Fix dialyzer

Author: Yuki Ito

include/msgpack.hrl

@@ -46,7 +46,7 @@
                                  jsx | jiffy |
                                  {allow_atom, none|pack} |
                                  {enable_str, boolean()} |
-                                 {ext, {msgpack_ext_packer(),msgpack_ext_unpacker()}}
+                                 {ext, {msgpack_ext_packer(),msgpack_ext_unpacker()} | module()}
                                 ].
 
 -record(options_v1, {
@@ -63,8 +63,8 @@
           impl = erlang      :: erlang | nif,
           allow_atom = none  :: none | pack, %% allows atom when packing
           enable_str = false :: boolean(), %% true for new spec
-          ext_packer = undefined   :: undefined | msgpack_ext_packer(),
-          ext_unpacker = undefined :: msgpack_ext_unpacker(),
+          ext_packer = undefined   :: msgpack_ext_packer()   | undefined,
+          ext_unpacker = undefined :: msgpack_ext_unpacker() | undefined,
           original_list = []       :: msgpack_list_options()
          }).
 

src/msgpack_packer.erl

@@ -195,7 +195,7 @@ pack_string(String, _Opt) ->
             end
     end.
 
--spec pack_array([msgpack:object()], list()) -> binary() | no_return().
+-spec pack_array([msgpack:object()], msgpack_option()) -> binary() | no_return().
 pack_array([], _) ->
     << 2#1001:4, 0:4/integer-unit:1 >>;