DeprecationWarning: metadata {'args': (None,)} was set from the constructor

[pllim]

Saw this warning in a downstream test. cc @maartenbreddels

../../.tox/py39-test-devdeps/lib/python3.9/site-packages/bqscales/__init__.py:18: in <module>
    from .scales import (  # noqa
../../.tox/py39-test-devdeps/lib/python3.9/site-packages/bqscales/scales.py:402: in <module>
    class DateScale(Scale):
../../.tox/py39-test-devdeps/lib/python3.9/site-packages/bqscales/scales.py:425: in DateScale
    min = Date(default_value=None, allow_none=True).tag(sync=True)
../../.tox/py39-test-devdeps/lib/python3.9/site-packages/bqscales/traits.py:56: in __init__
    super(Date, self).__init__(args=args, **kwargs)
../../.tox/py39-test-devdeps/lib/python3.9/site-packages/traitlets/traitlets.py:467: in __init__
    warn("metadata %s was set from the constructor. "
E   DeprecationWarning: metadata {'args': (None,)} was set from the constructor. With traitlets 4.1, metadata should be set using the .tag() method, e.g., Int().tag(key1='value1', key2='value2')

[martinRenou]

Thanks for reporting

[maartenbreddels]

@pllim glad to find you already reported this :)