This rule will fire if a value type (struct in C#) is larger than a maximum value (16 bytes by default). This is a problem because, unlike reference types, value types are bitwise-copied whenever they are assigned to a variable or passed to a method. If the type cannot be reduced in size then it should be turned into a reference type (class in C#).

            public struct BigArgb {
            	long a, r, g, b;
            }
            

            public sealed class BigArgb {
            	long a, r, g, b;
            }