@Override
        public ShapeType getShapeType() {
            return ShapeType.ENUM;
        }
Adds a synthetic version of the enum trait.

<p>This allows the enum shape to be used as if it were a string shape with
the enum trait, without having to manually add the trait or risk that it
gets serialized.
smithy-model/src/main/java/software/amazon/smithy/model/shapes/EnumShape.java