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Suppress -Wfloat-equal warning in implementation of gsl::narrow (#1043)
In the implementation of gsl::narrow, there is a comparison `static_cast<U>(t) != u` which may be comparing two floats. The comparison here is done purposefully to categorize ill effects of narrowing conversion, since the values being compared *should* be the same when compared with `operator==`. Note, using #pragma GCC will suppress this warning for both GCC and Clang.
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