Apparently there is some special meaning to the DashDash token when it is used in command mode, but I couldn't seem to uncover it. While trying to understand the tokenizer and parser I ran in to these two issues:

1. A DashDash token causes further Parameter tokens to be flagged as CommandName, which can be confusing with PSReadLine if PSReadLine if changed to prioritize the highlighting of CommandName over Parameter (Prioritize highlight of command names, prevent bleed from aligned nested tokens PSReadLine#989).
2. A DashDash token can be accepted as a command, when used with the invoke operators, but it does not get flagged with CommandName, and so causes PSReadLine to highlight it as a operator. Even when it is accepted as a command, the behavior in point 1 still occurs.

Steps to reproduce

& -- -NowACommandNameFlaggedToken