unchecked-dec

(unchecked-dec x)

Answers x minus one of integers wrapped to 64 bits, so (unchecked-dec -9223372036854775808) is 9223372036854775807. A double or a ratio takes the plain result. nil and non-numbers signal. As a value a one-argument function.

An integer past 64 bits is a plain integer here, so the oracle's unwrapped bigint (100000000000000000000N) wraps too.