Poulenc - Sept Chansons (1936) 

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i think in practice the second sopran would switch parts with the alto here

Obviously he was very well aware of what singers can or cannot do. For instance, that's why his works rarely feature very low notes for bass who are quite rare in France, contrary to Eastern countries (some of modern composers should keep this in mind...). My guess is that he wanted the voice colour of altos here rather than the soprano's.

Any mezzo soprano should be able to sing an A5 well

@@gangflow9139 for me, the alto's colour in high notes are very very beautiful... I really love it

@@ashleythorpe7933 that's a very high note tho

Perfect genius of Poulenc!