public String getInitDefault() {
      return initDefault;
    }
An expression to return a default instance of the type that this builder builds. For example,
if this is an {@code ImmutableList<String>} then the method {@code ImmutableList.of()} will
correctly return an empty {@code ImmutableList<String>}, assuming the appropriate context for
type inference. The expression here can assume that the statement from {@link
#getBeforeInitDefault} has preceded it.
value/src/main/java/com/google/auto/value/processor/PropertyBuilderClassifier.java