public static bool IsFlagUnset <TEnum>(this TEnum value, TEnum flags) where TEnum : struct, IComparable, IFormattable, IConvertible => !Holder <TEnum> .IsAnyFlagSetCallback(value, flags);
public static bool IsFlagUnset <TEnum>(this TEnum value, TEnum flags) where TEnum : struct, Enum => !Holder <TEnum> .IsAnyFlagSetCallback(value, flags);