How should the doubled jīm in «سِجِّيلٍ» be treated?

Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf

• Treat it as madd munfaṣil
• Articulate shaddah fully, without special ghunnah
• Give every jīm a nūn ghunnah
• Replace jīm with sīn