Chaining checking for initialization in Ivy Script

In the Ivy Designer Guide, Chapter 7, section Null handling / Automatic object creation, it states

You can to use the .# operator to suppress the automatic object creation.

if( in.#customer == null)
{
  // object is null
}

if (in.#customer is initialized)
{
  // object is not null or has been set to a non-default value
}

I also discover that we can do a chain of suppresing initialization like this:

if (in.#bigDataClass.#smallerDataClass.#smallDataClass.#tinyDataClass.#fieldXyz is initialized) {
    // Reach here if all of the properties are initialized
} else  {
   // Reach here if any of the properties are null
}

This really reduces the verbosity of the code when I want to check a deep structure of data classes. Despite its usefulness, I cannot find any (Ivy) documentation mentioning about this feature. I only discovered it by chance and have been using it until now.

My question is whether this is an official feature but has been forgotten to mention or it is an unofficial/hidden feature and could be dropped in the future?

Thanks & Regards