I think it might be worth adding -Wlogical-op to the standard warning
options (for supported compilers, determined by configure test).
`-Wlogical-op'
Warn about suspicious uses of logical operators in expressions.
This includes using logical operators in contexts where a bit-wise
operator is likely to be expected.
In addition to what it says there, it appears to warn about illogical
combinations of < and >. I have been using it locally for a while
without problems. We have already found a couple of bugs this way.
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