From f09ab0ca16f6909cc94912ee215b69f22f96c3f7 Mon Sep 17 00:00:00 2001
From: "thomas.kainrad" <thomas.kainrad@amplitude.com>
Date: Wed, 1 Oct 2025 10:28:42 +0200
Subject: [PATCH] fix: do not treat falsy values like 0 and false as undefined

---
 packages/experiment-core/src/evaluation/evaluation.ts | 2 +-
 packages/experiment-core/src/evaluation/select.ts     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/experiment-core/src/evaluation/evaluation.ts b/packages/experiment-core/src/evaluation/evaluation.ts
index 6fa22b48..7dc0518a 100644
--- a/packages/experiment-core/src/evaluation/evaluation.ts
+++ b/packages/experiment-core/src/evaluation/evaluation.ts
@@ -116,7 +116,7 @@ export class EvaluationEngine {
     // We need special matching for null properties and set type prop values
     // and operators. All other values are matched as strings, since the
     // filter values are always strings.
-    if (!propValue) {
+    if (propValue === undefined || propValue === null) {
       return this.matchNull(condition.op, condition.values);
     } else if (this.isSetOperator(condition.op)) {
       const propValueStringList = this.coerceStringArray(propValue);
diff --git a/packages/experiment-core/src/evaluation/select.ts b/packages/experiment-core/src/evaluation/select.ts
index fc3d0924..804e6c0b 100644
--- a/packages/experiment-core/src/evaluation/select.ts
+++ b/packages/experiment-core/src/evaluation/select.ts
@@ -11,7 +11,7 @@ export const select = (
     }
     selectable = (selectable as Record<string, unknown>)[selectorElement];
   }
-  if (!selectable) {
+  if (selectable === undefined || selectable === null) {
     return undefined;
   } else {
     return selectable;