ref: 32a1b47da6fe0e872c66d2721ff221ff1a5e8ba8 dir: /src/io.h/
sl_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;