No, it isn't. It's pretty valuable for Apple as a precursor to forbidding things like non-webkit html renderers even for applications outside the app store, though.
Apple has no such restriction even for iOS (HTML renderers).
However, you cannot technically implement a JavaScript JIT since they will not give you a security entitlement to create and execute arbitrary code. You would need to either leverage JavaScriptCore, or use a (drastically slower) interpreted mode for JavaScript.
However, you cannot technically implement a JavaScript JIT since they will not give you a security entitlement to create and execute arbitrary code. You would need to either leverage JavaScriptCore, or use a (drastically slower) interpreted mode for JavaScript.