add a note about custom directives

yyx990803 · yyx990803 · commit ef6b888b8c5f · 2019-01-22T22:22:06.000-05:00
diff --git a/active-rfcs/0000-dynamic-directive-arguments.md b/active-rfcs/0000-dynamic-directive-arguments.md
@@ -99,6 +99,10 @@ In addition, `v-slot` doesn't have an equivalent object syntax, since it's value
 
   That said, complex dynamic key bindings should probably be pre-transformed in JavaScript via a computed property.
 
+- Allowing dynamic arguments for all directives means custom directive implementations now also need to account for potential argument changes in addition to value changes.
+
+  This also requires the addition of `binding.oldArgs` to the custom directive binding context.
+
 # Alternatives
 
 N/A
