Slice a collection into chunks with optionally being able to make all chunks fixed size and provide default value for paddings

IEnumerable<>.Slice.cs

public static IEnumerable<IEnumerable<T>> Slice<T>(this IEnumerable<T> items, int size, bool fixedSize = false, T defaultValue = default(T))
{
    var start = 0;
    items = items.ToArray();
    var total = items.Count();
    while (start < total)
    {
        var res = items.Skip(start).Take(size).ToList();
        while (res.Count < size)
        {
            res.Add(defaultValue);
        }
        yield return res;

        start += size;
    }
}