[Flags]
[ProtoContract(EnumPassthru = true)]
public enum Categories
{
    [ProtoEnum(Name = nameof(Invalid), Value = 0x0)]
    Invalid = 0x0,

    [ProtoEnum(Name = nameof(A), Value = 0x1)]
    A = 0x1,
    [ProtoEnum(Name = nameof(B), Value = 0x2)]
    B = 0x2,
    [ProtoEnum(Name = nameof(C), Value = 0x4)]
    C = 0x4,
    [ProtoEnum(Name = nameof(D), Value = 0x8)]
    D = 0x8,
    [ProtoEnum(Name = nameof(Global), Value = 0x1 | 0x2 | 0x4 | 0x8)]
    Global = A | B | C | D,
}