Working on the fuzzer: https://github.com/uutils/coreutils/pull/4642 with gnu: ``` /usr/bin/expr 90 \| 67 = 10; echo $? 90 0 ``` With ours: ``` ./target/debug/coreutils expr 90 \| 67 = 10; echo $? 0 1 ``` Maybe related: https://github.com/uutils/coreutils/issues/5315