Dictionary passed to widget attr gets mutated

When a dictionary is passed to a Widget as the `attr` kwarg, to be used in filling HTML attributes, this dictionary is mutated, so cannot be reused. See below example to see a clear problem with this. Note how in the first form, when printer as_p(), the second field (session_end) gets an incorrect 'type' HTML attribute. This was tested in django 1.6

from django import forms    class FormWithBug(forms.Form):      attrs = {'type':'time', 'required':'true'}      session_start = forms.TimeField(widget=forms.TimeInput(attrs= attrs))      session_end = forms.TimeField(widget=forms.TimeInput(attrs=attrs))    class FormWithoutBug(forms.Form):      session_start = forms.TimeField(widget=forms.TimeInput(attrs= {'type':'time', 'required':'true'}))      session_end = forms.TimeField(widget=forms.TimeInput(attrs={'type':'time', 'required':'true'}))    FormWithBug().as_p()  FormWithoutBug().as_p()

In [36]: FormWithBug().as_p()  Out[36]: u'<p><label for="id_session_start">Session start:</label> <input id="id_session_start" name="session_start" required="true" type="time" /></p>\n<p><label for="id_session_end">Session end:</label> <input id="id_session_end" name="session_end" required="true" type="text" /></p>'    In [37]: FormWithoutBug().as_p()  Out[37]: u'<p><label for="id_session_start">Session start:</label> <input id="id_session_start" name="session_start" required="true" type="time" /></p>\n<p><label for="id_session_end">Session end:</label> <input id="id_session_end" name="session_end" required="true" type="time" /></p>'

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