From 6b8bd786d74b482e33d0f14feab29f13faf7b10c Mon Sep 17 00:00:00 2001
From: Anders Olsson <anders.e.olsson@gmail.com>
Date: Tue, 4 Aug 2026 21:38:48 +0200
Subject: [PATCH] style: make NaN rejection explicit in score_sigma validation

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DnsaJg74eNSva3PJjK2eej
---
 src/history.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/history.rs b/src/history.rs
index fbb050e..fb56932 100644
--- a/src/history.rs
+++ b/src/history.rs
@@ -779,7 +779,7 @@ impl<T: Time, D: Drift<T>, O: Observer<T>, K: Eq + Hash + Clone> History<T, D, O
                 }
                 crate::Outcome::Scored { scores, sigma } => {
                     let resolved = sigma.unwrap_or(self.score_sigma);
-                    if !(resolved > 0.0) {
+                    if resolved <= 0.0 || resolved.is_nan() {
                         return Err(InferenceError::InvalidParameter {
                             name: "score_sigma",
                             value: resolved,