I apologise, i thought that you were claiming 48 degrees as a "normal" stair angle.
Stay away from the space saver design if at all possible. Besides the safety angle there is the fact that you dis-bar various groupings, eg the old, from using the flight.
And come house sale time they are not everyone's cup of tea.
Modern domestic stairs are at approx 36 - 38 degrees FWIW.
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