Fix dialyzer warnings.

Fixed:
pokemon_pb.erl:52: The pattern <Default, _> can never match since previous clauses completely covered the type <_,'none'>
pokemon_pb.erl:53: The pattern <Val, _> can never match since previous clauses completely covered the type <_,'none'>
protobuffs.erl:373: Invalid type specification for function protobuffs:encode_field_tag/2. The success typing is (non_neg_integer(),0 | 1 | 2 | 5) -> [integer(),...]
protobuffs.erl:387: Invalid type specification for function protobuffs:encode_varint/1. The success typing is (integer()) -> [integer(),...]
protobuffs.erl:393: Invalid type specification for function protobuffs:encode_varint/2. The success typing is (integer(),[integer()]) -> [integer(),...]

Safe to ignore:
pokemon_pb.erl:46: The variable _ can never match since previous clauses completely covered the type #pikachu{}

src/pokemon_pb.erl

@@ -48,7 +48,6 @@ encode_extensions(_) -> [].
 iolist(pikachu, Record) ->
     [pack(1, required, with_default(Record#pikachu.abc, none), string, [])].
 
-with_default(Val, none) -> Val;
 with_default(Default, Default) -> undefined;
 with_default(Val, _) -> Val.
 

src/protobuffs.erl

@@ -26,7 +26,7 @@
 %% @doc A protcol buffers encoding and decoding module.
 -module(protobuffs).
 
-%% Pubic
+%% Public
 -export([encode/3, encode_packed/3, decode/2, decode_packed/2]).
 
 %% Used by generated *_pb file. Not intended to used by User
@@ -372,7 +372,7 @@ typecast(Value, _) ->
 %% @hidden
 -spec encode_field_tag(FieldID :: non_neg_integer(),
 		       FieldType :: encoded_field_type()) ->
-			      binary().
+			      iodata().
 encode_field_tag(FieldID, FieldType) when FieldID band 16#3fffffff =:= FieldID ->
     encode_varint((FieldID bsl 3) bor FieldType).
 
@@ -385,13 +385,13 @@ encode_varint_field(FieldID, Integer) ->
 
 %% @hidden
 -spec encode_varint(I :: integer()) ->
-			   binary().
+			   iodata().
 encode_varint(I) ->
     encode_varint(I, []).
 
 %% @hidden
 -spec encode_varint(I :: integer(), Acc :: list()) ->
-			   binary().
+			   iodata().
 encode_varint(I, Acc) when I =< 16#7f ->
     lists:reverse([I | Acc]);
 encode_varint(I, Acc) ->