new cli: terragrunt run and "single dash" arguments

[thederby]

I'm migrating some of our workflows to terragrunt run and would like some clarity on the new CLI pattern.

As of 0.80.2, terragrunt --help still shows the "single dash" arguments (-auto-approve, -destroy, -input=false|true, etc.) are valid, but they throw a "flag provided but not defined" error when used with terragrunt run.

Must all single dash arguments now be placed after a double dash?

For example,

terragrunt plan --terragrunt-non-interactive -input=false -destroy

would now be

terragrunt run plan --non-interactive -- -input=false -destroy

Is that correct?

Are there any single dash arguments that would not follow a --?

Somewhat related, the Migration Guide also provides the following "usually isn’t necessary" example:

terragrunt run -- apply -auto-approve.

When would one want to specify apply after the -- instead of terragrunt run apply -- -auto-approve?