Re: [whatwg/webidl] Add distinguishable state for cb and dictionary-like (PR #1353)

@domenic approved this pull request.

Looks good with a wording nit.

Can we get multi-implementer interest here somehow? In particular, making sure this doesn't break something deep in their binding system, for example.

If the API you intend to use this for has multi-implementer interest, then recruiting those people to come over here and say "yes, no problem with changing Web IDL to accommodate that API" would be perfect.

> @@ -3503,6 +3503,16 @@ the following algorithm returns <i>true</i>.
             <a href="#limit-bigint-numeric-overloading">a separate restriction on their use in
             overloading</a> below. Please also note <a href="#limit-bigint-numeric-unions">the
             advice about using unions of these types</a>.
+        1.  A [=callback function=] that does not have
+            [{{LegacyTreatNonObjectAsNull}}] extended attribute is
+            distinguishable from a dictionary-like category type.

```suggestion
            distinguishable from a type in the dictionary-like category.
```

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