Forked off from Bug 688486, comment 32. It's referring to this bit of code in ArrayObject::try_splice if (this->m_canBeSimple) { [...] } else { // (easiest for now to just disable the simple path than // to try to dynamically determine when it is available) deletedItems->m_canBeSimple = false; deletedItems->m_lengthIfSimple = 0; } We're already performing sufficient work in this path that we could probably afford to check if the result is simple. Its just ugly to put that sort of hook directly into the AtomList splice method.

Tamarin is a dead project now. Mass WONTFIX.

Tamarin isn't maintained anymore. WONTFIX remaining bugs.