Describe what happens

In the documentation I see that to_asdf is available for zfit data objects. However I only see to_asdf(); shouldn't there be a path so that we specify where to save? I am using that method and it does not do anything. So I assume it has not been implemented.

What is the recommended way to save this type of data? With pandas dataframes I use parquet because it is fast. How should we deal with these data objects?

Cheers.