INTERRUPT_NONE   1624 thread.c           return INTERRUPT_NONE;
INTERRUPT_NONE   1663 thread.c       	  case INTERRUPT_NONE: /* default: IMMEDIATE */
INTERRUPT_NONE   2033 thread.c       	    VALUE err = rb_threadptr_pending_interrupt_deque(th, blocking_timing ? INTERRUPT_ON_BLOCKING : INTERRUPT_NONE);