Using Integer type with SelectWidget renders wrong selected values

test.py

import deform
import colander


class TestSchema(colander.MappingSchema):
    list = colander.SchemaNode(colander.Integer(),
                               widget=deform.widget.SelectWidget(values=[(1, 'one'), (2, 'two')]))

class Test2Schema(colander.MappingSchema):
    list = colander.SchemaNode(colander.Integer(),
                               widget=deform.widget.SelectWidget(values=[('1', 'one'), ('2', 'two')]))



print deform.Form(TestSchema()).render({'list': 1})
print deform.Form(Test2Schema()).render({'list': 1})