It seems like common practice to treat #9 chords as altered chords and, being guitarist, the most common voicing of them I'm familiar with is the Hendrix chord:
e|-----| B|--8--| G|--7--| D|--6--| A|--7--| E|-----|
For those of you not familiar with tablature, that's E, G♯, D, and F♯♯. There's no fifth there, but the chord name doesn't specify that the fifth is altered. Yet, I can't help but feel that it wouldn't sound right with a perfect fifth. If you're using the altered scale over this chord, that makes sense as well. It only has the ♭5 and ♯5. I know that it's music, so I can do whatever I want and I should play whatever sounds good, but I'm looking for evidence, preferably from some notable jazzers, as to how the fifth of this chord acts.