/**
     * <p class="changed_added_5_0">
     * Performs the same logic as {@link #get(java.io.Serializable)} } but if no value is found, this will return the
     * the evaluated value from the given <code>defaultValueSupplier</code>
     * </p>
     *
     * @param key the key for which the value should be returned.
     * @param defaultValueSupplier the dynamic suppler which resolves the defaultValue if no value is found in the call to <code>eval()</code>.
     * @return the evaluated value.
     * @since 5.0
     */
    public static <T> T computeIfAbsent(Serializable key, Supplier<T> defaultValueSupplier) {
        T value = (T) get(key);
        if (value == null) {
            value = defaultValueSupplier.get();
            stateHelper.put(key, value);
        }
        return value;
    }