Correct specification of click flags

If creating flags with click, the documentation, says that you need to include the variable name (e.g., flag) as a param_decls so that click is able to correctly assign the value. I have two questions regarding this:

1. In my testing, it did not have any effect whether I added the variable name here, even if the command line option had a different name (like in the example in the documentation). Is it even necessary with the current version of typed settings?
2. If it is still necessary, how to deal with nested parameters in that case? Should I add the parent suffix (like typed settings does automatically) or the variable name like stated in the code? If the latter is true, then there may be name clashes.

If anything regarding my question is unclear, I am happy to provide additional details. And thank you very much for your effort with this great project!