-record(definition, {
    widget :: fun((formz@field:field(), formz@widget:args()) -> any()),
    parse :: fun((binary()) -> {ok, any()} | {error, binary()}),
    stub :: any(),
    optional_parse :: fun((fun((binary()) -> {ok, any()} | {error, binary()}), binary()) -> {ok,
            any()} |
        {error, binary()}),
    optional_stub :: any()
}).