From a89ce64a045503f4fd56d6aeaf9f694218a72903 Mon Sep 17 00:00:00 2001
From: Adam Simon <adamosimoni@gmail.com>
Date: Fri, 2 Feb 2024 10:03:12 +0100
Subject: [PATCH] Improve number to canonical string formatting

---
 src/ConfigCatClient/Evaluation/RolloutEvaluator.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/ConfigCatClient/Evaluation/RolloutEvaluator.cs b/src/ConfigCatClient/Evaluation/RolloutEvaluator.cs
index d19290f3..1d4993b3 100644
--- a/src/ConfigCatClient/Evaluation/RolloutEvaluator.cs
+++ b/src/ConfigCatClient/Evaluation/RolloutEvaluator.cs
@@ -868,7 +868,11 @@ private static string UserAttributeValueToString(object attributeValue)
         }
         else if (attributeValue.TryConvertNumericToDouble(out var number))
         {
-            return number.ToString(CultureInfo.InvariantCulture).Replace("E", "e");
+            var abs = Math.Abs(number);
+            var format = 1e-7 < abs && abs < 1e21
+                ? "0.#################"
+                : "0.#################e+0";
+            return number.ToString(format, CultureInfo.InvariantCulture);
         }
         else if (attributeValue.TryConvertDateTimeToDateTimeOffset(out var dateTimeOffset))
         {