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scriptc/docs/content/limitations/foreign-thread-callbacks.mdx
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FFI format 5 accepts retained, context-bearing `void` callbacks invoked by library-owned threads. The native callback copies arguments and queues work; the script closure runs on the event loop at least one turn later. These callbacks are not suitable for real-time execution.
Value-returning callbacks and direct script execution on foreign threads are unsupported. Reference counting and exception state belong to the script thread, and waiting for the event loop can deadlock.