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Handling of long integers is broken for arguments to sqlite functions created with the create_function api. Integers passed to a sqlite function are always converted to int instead of long, which produces an incorrect value for integers outside the range of a int32 on a 32 bit machine. These failures cannot be reproduced on a 64 bit machine, since sizeof(long) == sizeof(long long).
I attached a program that demonstrates the failure. This program reports failures on a 32 bit machine, and all tests pass on a 64 bit machine.