bits: include limits
bits: include limits

Per #69.

markokr/libusual,rabbitt/libusual,mgjv/libusual,rabbitt/libusual,rabbitt/libusual,mgjv/libusual,ifduyue/libusual,markokr/libusual,ifduyue/libusual,markokr/libusual,ifduyue/libusual,rabbitt/libusual,mgjv/libusual,mgjv/libusual,markokr/libusual,ifduyue/libusual