Shooting an arrow from the side to a shulker bounces off, shooting an arrow from directly above causes it to hit the shulker.
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is duplicated by 7
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Confirmed for 15w39b
Confirmed for 15w39c
Confirmed for 15w40a
Confirmed for 15w41b
Confirmed for 15w42a
Confirmed for 15w43a
Confirmed for 15w44a

Updating issue to how it is now, let me know if I mess anything up.
edit:
But when you shoot at the edge of a shulker it constantly bounces around.
I believe this was fixed in 15w45a.
Confirmed for 15w46a
Confirmed for 15w47c
Confirmed for 15w38a and 15w38b