`OptionEqualityComparer.GetHashCode` does not use passed comparer

[bash]

Current implementation:

public override int GetHashCode(Option<TItem> option)
    => option.Match(
        none: 0,
        some: item => item.GetHashCode());

should be:

public override int GetHashCode(Option<TItem> option)
    => option.Match(
        none: 0,
        some: _comparer.GetHashCode);