ref: b78c9edfb4e91efa4aa61e09feaf3da4848342b0 dir: /src/io.h/
ios *toio(sl_v v); bool isio(sl_v v) sl_purefn; sl_v io_to_str(sl_v *ps); void io_init(void); extern sl_v sl_iooutsym; extern sl_type *sl_iotype;