Get rid of a few dialyzer warnings

src/geef_oid.erl

@@ -18,7 +18,7 @@ hex(Oid) ->
     geef_nif:oid_fmt(Oid).
 
 %% @doc Parse an iolist as a hash
--spec parse(iolist()) -> geef_oid:oid().
+-spec parse(iolist() | binary()) -> geef_oid:oid().
 parse(Sha) ->
     geef_nif:oid_parse(Sha).
 

src/geef_ref.erl

@@ -8,7 +8,7 @@
 -type iterator() :: #geef_iterator{type :: ref}.
 -type type() :: oid | symbolic.
 -type target() :: binary() | geef_oid:oid().
--type ref() :: #geef_reference{name :: binary()}.
+-type ref() :: #geef_reference{repo :: pid(), name :: binary()}.
 -export_type([reference/0, type/0, target/0, iterator/0]).
 
 -spec create(pid(), iolist(), geef_oid:oid(), boolean()) -> {ok, ref()} | {error, term()}.
@@ -106,10 +106,10 @@ shorthand(#geef_reference{name=Name}) ->
     shorthand(Name).
 
 %% @doc Return whether the reference has a reflog
--spec has_log(pid(), iolist()) -> {ok, boolean()} | {error, term()}.
+-spec has_log(pid(), iolist() | binary()) -> {ok, boolean()} | {error, term()}.
 has_log(Repo, Name) ->
     geef_repo:reference_has_log(Repo, Name).
 
--spec has_log(ref()) -> boolean() | {ok, boolean()} | {error | term()}.
+-spec has_log(ref()) -> {ok, boolean()} | {error, term()}.
 has_log(#geef_reference{repo=Repo, name=Name}) ->
     has_log(Repo, Name).

src/geef_sig.erl

@@ -34,7 +34,7 @@ now(Name, Email) ->
 
 %% @private
 %% @doc convert the return from the NIF to a signature
--spec convert(binary(), binary(), non_neg_integer(), non_neg_integer()) -> signature().
+-spec convert(iolist(), iolist(), non_neg_integer(), non_neg_integer()) -> signature().
 convert(Name, Email, Timestamp, Offset) ->
             Time = {{Timestamp div 1000000, Timestamp rem 1000000, 0}, Offset},
             #geef_signature{name=Name, email=Email, time=Time}.