add logging for failures to parse values

packages/elixir-client/lib/electric/client/message.ex

@@ -54,26 +54,40 @@ defmodule Electric.Client.Message do
             offset: Offset.t()
           }
 
+    require Logger
+
     def from_message(msg, value_mapping_fun) do
       %{
         "headers" => headers,
         "offset" => offset,
-        "value" => value
+        "value" => raw_value
       } = msg
 
+      value =
+        try do
+          value_mapping_fun.(raw_value)
+        rescue
+          exception ->
+            Logger.error(
+              "Unable to cast field values: #{Exception.format(:error, exception, __STACKTRACE__)}"
+            )
+
+            reraise exception, __STACKTRACE__
+        end
+
       %__MODULE__{
         key: msg["key"],
         offset: Client.Offset.from_string!(offset),
         headers: Headers.from_message(headers),
-        value: value_mapping_fun.(value)
+        value: value
       }
     end
   end
 
   defmodule ResumeMessage do
     @moduledoc """
     Emitted by the synchronisation stream before terminating early. If passed
-    as an option to [`Client.stream`](`Electric.Client.stream/3`) allows for
+    as an option to [`Client.stream/3`](`Electric.Client.stream/3`) allows for
     resuming a shape stream at the given point.
 
     E.g.