code: public static TagContext getValue(Context context) {
      @javax.annotation.Nullable TagContext tags = TAG_CONTEXT_KEY.get(context);
      return tags == null ? EMPTY_TAG_CONTEXT : tags;
    }
docs: Returns the value from the specified {@code Context}.
  
  @param context the specified {@code Context}.
  @return the value from the specified {@code Context}.
  @since 0.21