@Override
        public Void bigDecimalShape(BigDecimalShape bigDecimalShape) {
            writer.write("$T.valueOf($L)", BigDecimal.class, defaultValue.expectNumberNode().getValue().doubleValue());
            return null;
        }
Adds default values to builder properties.
smithy-trait-codegen/src/main/java/software/amazon/smithy/traitcodegen/generators/BuilderGenerator.java