different result of '_compare_equal' prefix match with epoch

[sify21]

see the results:

this happens when specifier is longer that prospective and epoch is involved. The problem originates from the function _pad_version in packaging.specifiers.

def _pad_version(left: List[str], right: List[str]) -> Tuple[List[str], List[str]]:
    left_split, right_split = [], []

    # Get the release segment of our versions
    left_split.append(list(itertools.takewhile(lambda x: x.isdigit(), left)))
    right_split.append(list(itertools.takewhile(lambda x: x.isdigit(), right)))

    # Get the rest of our versions
    left_split.append(left[len(left_split[0]) :])
    right_split.append(right[len(right_split[0]) :])

    # Insert our padding
    left_split.insert(1, ["0"] * max(0, len(right_split[0]) - len(left_split[0])))
    right_split.insert(1, ["0"] * max(0, len(left_split[0]) - len(right_split[0])))

    return (list(itertools.chain(*left_split)), list(itertools.chain(*right_split)))

This function didn't take into account the situation where epoch exists. see the testing results.