from typing import Tuple


def split_item(item: str) -> Tuple[str, str]:
    """Split a key/value pair in a string into a tuple (key, value).

    This also strips space from both sides of either.

    Args:
        item: A key/value string in 'key: value' format.

    Returns:
        The (key, value) tuple, with both sides stripped.
    """
    lhs, rhs = item.split(':', maxsplit=1)
    return lhs.strip(), rhs.strip()