def do_lower(s):
    return soft_unicode(s).lower()
Test insertion of duplicate values in a namespace.
dataset/ETHPy150Open IanLewis/kay/kay/lib/jinja2/filters.py/do_lower--crossover with--dataset/ETHPy150Open MapQuest/mapquest-osm-server/src/python/tests/test_lrucache.py/test_duplicate_values