.quad bignums.quad expects zero or more bignums, separated by commas. For
each bignum, it emits
an 8-byte integer. If the bignum won't fit in 8 bytes, it prints a
warning message; and just takes the lowest order 8 bytes of the bignum.
The term “quad” comes from contexts in which a “word” is two bytes;
hence quad-word for 8 bytes.