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Without this modifications, threads created with the THREADS:MAKE-THREADS cannot successfully call the EXT:QUIT or EXT:EXIT functions. This prevented the SLIME quit implementation from successfully quitting implementations. Note that all threads can always execute a form like (jstatic "exit" "java.lang.System" 0) to uncermoniously exit the JVM, so there is nothing gained security-wise by preventing threads from using the official Lisp interfaces.
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