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sprintf(buff, "%.19" NVgf, SvNV(arg)); and sv_setpvf(keysv, "%.19" NVgf, SvNV(arg));
sv_setpvf(keysv, "%.19" NVgf, SvNV(arg)); with sv_setpvf(keysv, "%.19g", SvNV(arg));