Can a 6th level Sorcerer flex 6 sorcery points into 4th level spell slot?

@SorcererQzot @mikemearls @dungeonbastardCan a Sorc 6 flex 6 sorcery points into 4th level spell slot? Sorc 7 flex 7 to 5th level slot? Yes.

— Jeremy Crawford (@JeremyECrawford) April 22, 2016