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logb and logbf returned the host's logb, which sets ERANGE for a zero argument on Windows and returns signalling NaNs unquieted. The titles' copies are FreeBSD msun's s_logb.c and s_logbf.c, which set no errno and quiet a NaN through x * x; both functions now compute that algorithm. Co-Authored-By: Claude Opus 5.5 <[email protected]>