What does the doubled ʿayn in «يَدُعُّ» NOT require?

Al-Māʿūn and Al-Humazah: Applied Assimilation, Concealment, Madd and Hāʾ Rules

• Keeping ʿayn distinct
• The special ghunnah of doubled nūn/mīm
• Preserving ʿayn’s articulation
• Correctly realizing shaddah