gef➤  p vp+3
$8 = (JS::Value *) 0x7ffff4e0d0a8
gef➤  p *(vp+3)
$9 = $jsval(-6.2774385622041925e+66)
gef➤  p JS::Value *(vp+3)
A syntax error in expression, near `vp+3)'.
gef➤  p (JS::Value) *(vp+3)
$10 = $jsval(-6.2774385622041925e+66)