| dictionary-like
@@ -3505,6 +3505,16 @@ the following algorithm returns true.
a separate restriction on their use in
overloading below. Please also note the
advice about using unions of these types.
+ 1. A [=callback function=] that does not have
+ [{{LegacyTreatNonObjectAsNull}}] extended attribute is
+ distinguishable from a type in the dictionary-like category.
+
+ For example, when converting an ECMAScript value to [=union
+ type=] which includes a [=callback function=] and a
+ dictionary-like type, if the value is [=ECMAScript/callable=],
+ then it is converted to a [=callback function=]. Otherwise, it is
+ converted to a dictionary-like type.
+
|