A TypeError happened with ujson.dumps imported and DEBUG set True

[furoxr]

With app.debug set True, and the module ujson imported, When I accessed the doc of api, a TypeError was raised.

In the representations.py, the code of importing dumps

from __future__ import unicode_literals, absolute_import

try:
    from ujson import dumps
except ImportError:
    from json import dumps

from flask import make_response, current_app

and the function output_json in the same file

def output_json(data, code, headers=None):
    '''Makes a Flask response with a JSON encoded body'''

    settings = current_app.config.get('RESTPLUS_JSON', {})

    # If we're in debug mode, and the indent is not set, we set it to a
    # reasonable value here.  Note that this won't override any existing value
    # that was set.
    if current_app.debug:
        settings.setdefault('indent', 4)

    # always end the json dumps with a new line
    # see https://github.com/mitsuhiko/flask/pull/1262
    dumped = dumps(data, **settings) + "\n"

    resp = make_response(dumped, code)
    resp.headers.extend(headers or {})
    return resp

ujson.dumps() accepts one arg, while json.dumps() accepts one or more. So, when the app.debug is true, dumps will receive two args, 'data' and 'settings', with settings = { 'indent' : 4 }.

Then TypeError: 'indent' is an invalid keyword argument for this function

[ziirish]

Hopefully this will be addressed with #589