/**
   * Constructs a new type token of {@code T}.
   *
   * <p>Clients create an empty anonymous subclass. Doing so embeds the type parameter in the
   * anonymous class's type hierarchy so we can reconstitute it at runtime despite erasure.
   *
   * <p>For example:
   *
   * <pre>{@code
   * TypeToken<List<String>> t = new TypeToken<List<String>>() {};
   * }</pre>
   */