Potentional bug: AbstractGeneratedTypeBuilder allows multiple addition of elements witch equals

Potentional bug: AbstractGeneratedTypeBuilder allows multiple addition (via add* methods) of elements witch equals. Check of duplicity of added elements is missing in add* methods of AbstractGeneratedTypeBuilder and subclass GeneratedTypeBuilderImpl.

For an example, it is possible to add two constants with the same type, name and value:

GeneratedTypeBuilder generatedTypeBuilder = new GeneratedTypeBuilderImpl("my.package","MyName");

Constant constant1 = generatedTypeBuilder.addConstant(Types.typeForClass(String.class), "myConstant", "myConstantValue");

Constant constant2 = generatedTypeBuilder.addConstant(Types.typeForClass(String.class), "myConstant", "myConstantValue");

constant2 != null //true, constant2 is not null
constant2 != constant1 //true, constant2 is a reference to new object
constant2.equals(constant1); // true, constant1 and constant2 are equal (they have the same name, type and value)

generatedTypeBuilder.toInstance().getConstantDefinitions().size() //2

The same behavior is present also in other add* methods.

Notice: Maybe this is not a bug and the check is performed somewhere else just before generation of source code from these objects.