Why is MediaPlaylist.Segments a ring buffer instead of a normal slice?

[eric]

I've been trying to reason out why the usage of MediaPlaylist.Segments is why it is and I have trouble coming up with good reasoning.

It seems that head and tail are used internally but not exposed anywhere publicly, so it is impossible to get a MediaPlaylist.Segments that matches the internal state.

It doesn't make sense to me why we can't just have MediaPlaylist.Segments be a strait forward slice where the capacity always maps to what is really defined.

Does anyone have any insight for why it is implemented this way?