So it seems that though the scripting language is nominally, and maybe even syntactically "JavaScript", the engine interpreting the code has been honed to ensur

So it seems that though the scripting language is nominally, and maybe even syntactically "JavaScript", the engine interpreting the code has been honed to ensure consistency and reliability. Since JS 3.0 is being used, I assume it's a lot simpler interpreter, no JIT involved, etc.? I'm curious as to what they might have removed/changed/fixed in the language?