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Deserialize explicitly blank strings
Default behavior of urllib.parse_qs is to discard blank values, causing a preference of none to be deserialized as undefined, using the instance default rather than the selected preference.
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@ -441,7 +441,7 @@ class Preferences:
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"""parse (base64) preferences from request (``flask.request.form['preferences']``)"""
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bin_data = decompress(urlsafe_b64decode(input_data))
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dict_data = {}
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for x, y in parse_qs(bin_data.decode('ascii')).items():
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for x, y in parse_qs(bin_data.decode('ascii'), keep_blank_values=True).items():
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dict_data[x] = y[0]
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self.parse_dict(dict_data)
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