Is Staff of Power intended to benefit “spell damage rolls”?

@JeremyECrawford Staff of Power adds to attack, spell attack, and damage rolls. Is it intended to benefit "spell damage rolls"?

— Aiyang Wang (@Selekate) October 15, 2016

The staff of power grants a bonus to the damage rolls you make when you use it as a magic quarterstaff, not when you cast spells. #DnD https://t.co/w11df8qHvC

— Jeremy Crawford (@JeremyECrawford) October 15, 2016