```python
def fold_ends(values: list) -> list:
    """Fold a list onto itself by adding the first entry to the last, the second to the second-last, and so on, returning the totals in that order. A list of an odd length leaves its middle entry as its own total."""
    result = []
    n = len(values)
    for i in range(n // 2):
        result.append(values[i] + values[n - 1 - i])
    if n % 2 == 1