[css-counter-styles] Propose to make "disc" not overridable #1521

"disc" is the initial value of list-style-type, and making it overridable may add some unnecessary complexity to implementation. I hope we can make it not overridable like decimal.

So my proposal is:

Additionally, in the context of the prelude of an @counter-style rule, an ASCII case-insensitive match for "decimal" or "disc" is also an invalid and makes the @counter-style rule invalid.