code: protected FieldVisitor onVisitField(int modifiers, String internalName, String descriptor, String signature, Object defaultValue) {
          return super.visitField(modifiers, internalName, descriptor, signature, defaultValue);
      }
docs: An order-sensitive invocation of {@link ClassVisitor#visitField(int, String, String, String, Object)}.
  
  @param modifiers    The field's modifiers.
  @param internalName The field's internal name.
  @param descriptor   The field type's descriptor.
  @param signature    The field's generic signature or {@code null} if the field is not generic.
  @param defaultValue The field's default value or {@code null} if no such value exists.
  @return A field visitor to visit the field or {@code null} to ignore it.