Add pokémon clauses for unknown messages

CHANGELOG.md

@@ -6,6 +6,16 @@ The format is based on [Keep a
 Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 1.0.1 - 2024-06-26
+
+### Fixed
+
+- Ignored unknown info messages in `Volley.InOrderSubscription` and
+  `Volley.PersistentSubscription`.
+    - This protects against the `{:caught_up, reference()}` and
+      `{:fell_behind, reference()}` notifications introduced in
+      EventStore 23.10 and later.
+
 ## 1.0.0 - 2022-05-11
 
 This change represents stability in the API. There is no functional change

lib/volley/in_order_subscription.ex

@@ -458,6 +458,10 @@ defmodule Volley.InOrderSubscription do
     {:stop, reason, state}
   end
 
+  def handle_info(_, state) do
+    {:noreply, [], state}
+  end
+
   # coveralls-ignore-stop
 
   defp read_stream(state, demand) do

lib/volley/persistent_subscription.ex

@@ -163,6 +163,13 @@ defmodule Volley.PersistentSubscription do
     {:noreply, [map_event(event, state)], state}
   end
 
+  # coveralls-ignore-start
+  def handle_info(_, state) do
+    {:noreply, [], state}
+  end
+
+  # coveralls-ignore-stop
+
   @impl GenStage
   def handle_demand(_demand, state) do
     {:noreply, [], state}