PyPy does strange things

gistfile1.py

def min_max_native(indata):
    def _minmax(data):
        _value = itemgetter(2)
        low = min(data, key=_value)
        high = max(data, key=_value)
        return (_value(low), _value(high))


    copy = indata[:]
    minmax = _minmax(copy)
    return minmax


def min_max_sort(indata):
    def _minmax(data):
        _value = itemgetter(2)
        data.sort(key=_value)
        low = data[0]
        high = data[-1]
        return (_value(low), _value(high))


    copy = indata[:]
    minmax = _minmax(copy)
    return minmax