anchor.diff:  
   %%--------------------------------------------------------------------
   %% @doc
  -%% Store a value in a database file.
  +%% Store a value in a database file and commit the transaction.
  +%%
  +%% This function is logically the equicalent of calling `put' followed
  +%% by `txn_commit' except that it is implemented with the driver and is
  +%% therefore more efficient.
   %%
   %% @spec put_commit(Db, Key, Value, Opts) -> ok | {error, Error}
   %% where
  
positive.code: %% @doc
  %% Opens a cursor on a database.
  %%
  %% @spec cursor_open(Db) -> {ok, Db} | {error, Error}
  %% where
  %%    Db = integer()
  %%
  
negative.code: 
  %%--------------------------------------------------------------------
  %% @doc
  %% Store a value in a database file and commit the transaction.
  %%
  %% @spec put_commit(Db, Key, Value) -> ok | {error, Error}
  %% where
  