Syntax of `dnf config-manager --setopt`

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1

The docs says:

dnf config-manager [options] <section>...
…
<section>
This argument can be used to explicitly select the configuration sections to manage. A section can either be main or a repoid. If not specified, the program will select the main section and each repoid used within any --setopt options. A repoid can be specified using globs.
…
--setopt=<option>=<value>
Set a configuration option. To set configuration options for repositories, use repoid.option for the <option>. Globs are supported in repoid.
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dnf config-manager --save --setopt=*.proxy=http://proxy.example.com:3128/ <repo1> <repo2>
Update proxy setting in repositories with repoid and and make the change permanent.

And this brings to my mind the following questions:
What is the difference between dnf config-manager --save --setopt=test.proxy=example.com and dnf config-manager --save --setop=proxy=example.com test?

If " If not specified, the program will select the main section and each repoid used within any --setopt options. A repoid can be specified using globs." is true, does dnf config-manager --save --setopt=*.proxy=http://proxy.example.com:3128/ <repo1> <repo2> will change repo1, repo2 and main confs?

2

Also, what dnf config-manager --setopt=proxy=example.com test i.e. --set-opt without --save do?

3

Ping pong

4

What is this good for?