How do iltifāt and the fronting of «إِيَّاكَ» differ?

Iltifāt and Related Departures from Expected Expression

• Iltifāt causes restriction, while fronting shifts person
• They are merely two names for the same device
• Iltifāt shifts address; fronting expresses restriction
• Iltifāt deletes a pronoun; fronting deletes the predicate