def sum_even_fibonacci(limit: int) -> int:
    """
    Sums even terms in the Fibonacci sequence.
    :param limit: Limit for the sequence, non-inclusive.
    :return: Sum of even terms in the Fibonacci sequence.
    """
    term_a = 1
    term_b = 2
    result = 0

    while term_b < limit:
        if not term_b % 2:
            result += term_b

        term_a, term_b = term_b, term_a + term_b

    return result