Fix signbit detection (#423)
Fix signbit detection (#423)

mojoBrendan/fmt,alabuzhev/fmt,alabuzhev/fmt,cppformat/cppformat,alabuzhev/fmt,mojoBrendan/fmt,cppformat/cppformat,lightslife/cppformat,mojoBrendan/fmt,lightslife/cppformat,cppformat/cppformat,lightslife/cppformat