'OERP.write_record()' and 'OERP.unlink_record()' methods does not use the user context by default

I am trying to update a product record, but on write_record it is always reversed to the original entry:

>>> import oerplib
>>> oerp = oerplib.OERP(server='localhost', protocol='xmlrpc', database='fau_fablab', port=8069)
>>> user = oerp.login(user='admin', passwd='xxxxxxxxxxx')
>>> m = oerp.get('product.product')
>>> product = oerp.browse('product.product', 1)
>>> product.name
'Dienstleistung'
>>> product.name = "FOO"
>>> product.name
'FOO'
>>> oerp.write_record(product)
True
>>> product.name
'Dienstleistung'

What is happening here?