Unity editor enum compression for invalid states

SimplifyEnum.cs

private static class EnumCache<T> where T : Enum {
    public static T[] Values { get; } = (T[])Enum.GetValues(typeof(T));
}

// 32-bit max enum simplification
private static int SimplifyEnum<T>(T e) where T: Enum {
    var values = EnumCache<T>.Values;
    var max = 0;
    var number = Convert.ToInt32(e);
    
    for (int i = 0; i < values.Length; i++) {
        var bit = (int)values.GetValue(i);

        if (bit == number) {
            return bit;
        }

        if (bit > max) {
            max |= bit;
        }
    }

    // can't convert back to T without boxing
    // so just returns the number
    return number & max;
}

Usage:

MyEnum value = (MyEnum)SimplifyEnum(enumValue);