⊦ cast(i, j) = bits2int(lastn(i→n(i), fillsgn(i→n(i), int2bits(j))))
0 < i, i→n(i) < # int2bits(bits2int(lastn(i→n(i), fillsgn(i→n(i), int2bits(j))))) ⊦
Used terms: j, i