core/src/com/google/inject/internal/MoreTypes.java
public static Type canonicalize(Type type) {
    if (type instanceof Class) {
      Class<?> c = (Class<?>) type;
      return c.isArray() ? new GenericArrayTypeImpl(canonicalize(c.getComponentType())) : c;

    } else if (type instanceof CompositeType) {
      return type;

    } else if (type instanceof ParameterizedType) {
      ParameterizedType p = (ParameterizedType) type;
      return new ParameterizedTypeImpl(
          p.getOwnerType(), p.getRawType(), p.getActualTypeArguments());

    } else if (type instanceof GenericArrayType) {
      GenericArrayType g = (GenericArrayType) type;
      return new GenericArrayTypeImpl(g.getGenericComponentType());

    } else if (type instanceof WildcardType) {
      WildcardType w = (WildcardType) type;
      return new WildcardTypeImpl(w.getUpperBounds(), w.getLowerBounds());

    } else {
      // type is either serializable as-is or unsupported
      return type;
    }
  }
public static Type canonicalize(Type type) {
    if (type instanceof Class) {
      Class<?> c = (Class<?>) type;
      return c.isArray() ? new GenericArrayTypeImpl(canonicalize(c.getComponentType())) : c;

    } else if (type instanceof CompositeType) {
      return type;

    } else if (type instanceof ParameterizedType) {
      ParameterizedType p = (ParameterizedType) type;
      return new ParameterizedTypeImpl(
          p.getOwnerType(), p.getRawType(), p.getActualTypeArguments());

    } else if (type instanceof GenericArrayType) {
      GenericArrayType g = (GenericArrayType) type;
      return new GenericArrayTypeImpl(g.getGenericComponentType());

    } else if (type instanceof WildcardType) {
      WildcardType w = (WildcardType) type;
      return new WildcardTypeImpl(w.getUpperBounds(), w.getLowerBounds());

    } else {
      // type is either serializable as-is or unsupported
      return type;
    }
  }
Returns a type that is functionally equal but not necessarily equal according to {@link
Object#equals(Object) Object.equals()}. The returned type is {@link Serializable}.