lager format doesn't support tail binary as io_list [JIRA: RIAK-2434]

[pichi]

1> application:get_all_key(lager).
{ok,[{description,"Erlang logging framework"},
     {id,[]},
     {vsn,"3.1.0"},
     {modules,[error_logger_lager_h,lager,lager_app,
               lager_backend_throttle,lager_common_test_backend,
               lager_config,lager_console_backend,lager_crash_log,
               lager_default_formatter,lager_file_backend,lager_format,
               lager_handler_watcher,lager_handler_watcher_sup,lager_msg,
               lager_stdlib,lager_sup,lager_transform,lager_trunc_io,
               lager_util]},
     {maxP,infinity},
     {maxT,infinity},
     {registered,[lager_sup,lager_event,lager_crash_log,
                  lager_handler_watcher_sup]},
     {included_applications,[]},
     {applications,[kernel,stdlib,goldrush]},
     {env,[{async_threshold_window,50},
           {crash_log_size,10485760},
           {error_logger_hwm,100},
           {error_logger_redirect,true},
           {colored,true},
           {crash_log_count,5},
           {crash_log,"log/crash.log"},
           {crash_log_msg_size,65536},
           {async_threshold,500},
           {crash_log_date,"$D0"},
           {handlers,[{lager_console_backend,...},{...}]},
           {colors,[{...}|...]},
           {included_applications,[]},
           {extra_sinks,...}]},
     {mod,{lager_app,[]}},
     {start_phases,undefined}]}
2> lager:log(info, [], "~s", [[$>|<<"hello world">>]]).
ok
11:04:35.465 [info] FORMAT ERROR: "~s" [[62|<<"hello world">>]]
3> io:format("~s~n", [[$>|<<"hello world">>]]).   
>hello world
ok

[Vagabond]

See if #327 fixes this for you.