From d56cf1aa89646d1a9e97fe700d6a597ea1e21b1b Mon Sep 17 00:00:00 2001
From: Montgomery Alban <mtuck2005@yahoo.ca>
Date: Tue, 31 Oct 2023 18:29:19 +0000
Subject: [PATCH] Fix issue where a lambda cannot be serialized.

---
 envision/data_formatter.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/envision/data_formatter.py b/envision/data_formatter.py
index 1a0dae4e36..b1afd2f102 100644
--- a/envision/data_formatter.py
+++ b/envision/data_formatter.py
@@ -74,6 +74,8 @@ class Operation(IntEnum):
 
 _primitives = {int, float, str, VehicleType, TrafficActorType}
 
+def _passthrough_method_1_arg(v):
+    return v
 
 class ReductionContext:
     """Mappings between an object and its reduction to an ID."""
@@ -126,7 +128,7 @@ class EnvisionDataFormatterArgs(NamedTuple):
     """Data formatter configurations."""
 
     id: Optional[str]
-    serializer: Callable[[list], Any] = lambda d: d
+    serializer: Callable[[list], Any] = _passthrough_method_1_arg
     float_decimals: int = 2
     bool_as_int: bool = True
     enable_reduction: bool = True