def merge_fast_two(one, two):
    """ Merge two dictionaries performantly into an instance of “dict”.
        
        Based on this extremely beloved SO answer:
            https://stackoverflow.com/a/26853961/298171
    """
    # N.B. the dict-expanded operands appear here in the opposite order
    # from their positions in the function signature due to the way keys
    # take precedence in this sort of expression – this is detailed further
    # in the SO post – but the upshot is that this is the functional
    # equivalent to the “merge_two(…)” function, below.
    return { **two, **one }