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This disables JIT for JSC (JavaScriptCore) system-wide. Third party apps never had been able to JIT on iOS, no permission to write executable pages.

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Isn't it possible to used JIT for JSC in WebView?

WKWebView and SafariViewController do, but they run the browser engine and JIT in another process so that the app still doesn’t have the ability to execute unsigned pages.

Interesting! How are unsigned pages determined this case?

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