From 553741557a57df44a46fb3ab72b6aafeaf945337 Mon Sep 17 00:00:00 2001
From: Inference_ <68734681+Inference1@users.noreply.github.com>
Date: Sun, 25 Oct 2026 07:59:27 -0400
Subject: [PATCH] fix: validate boolean environment variables with strict
 parsing (#218)

---
 deepinfer/environ.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/deepinfer/environ.py b/deepinfer/environ.py
index 332064a..e3a55bb 100644
--- a/deepinfer/environ.py
+++ b/deepinfer/environ.py
@@ -7,10 +7,17 @@ from datetime import timedelta
 from typing import Any
 
 DEFAULT_PREFILL_MAX_SUM_SEQLEN_K = 2**30
+_FALSE = {"0", "", "false"}
+_TRUE = {"1", "true"}
 
 
 def _bool(v: str | None, default: str = "0") -> bool:
-    return (v if v is not None else default) not in ("0", "", "false", "False")
+    value = (v if v is not None else default).lower()
+    if value in _FALSE:
+        return False
+    if value in _TRUE:
+        return True
+    raise ValueError("expected one of '0', '1', 'false', 'true' (case-insensitive)")
 
 
 def _int(v: str | None, default: int = 0) -> int: