From e95782eba7440411ec1649f47588002f5988fc58 Mon Sep 17 00:00:00 2001
From: atsiv sivat <atsiv1@proton.me>
Date: Sun, 8 Mar 2026 00:57:03 +0000
Subject: [PATCH] add function safeBigInt to wrap BigInt values and provide
 useful errors

---
 src/core/lib/IEEEBinary.mjs | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/core/lib/IEEEBinary.mjs b/src/core/lib/IEEEBinary.mjs
index 16e838eeb..fc407245b 100644
--- a/src/core/lib/IEEEBinary.mjs
+++ b/src/core/lib/IEEEBinary.mjs
@@ -28,6 +28,14 @@ function normaliseInput(input) {
     return String(input).trim();
 }
 
+function safeBigInt(str, context="number") {
+    try {
+        return BigInt(str);
+    } catch {
+        throw new Error(`Invalid ${context}`);
+    }
+}
+
 
 /**
  * Compute 10^exp as BigInt without using ** on BigInt, to avoid
@@ -216,19 +224,19 @@ export function ToIEEE754Float64(input) {
     const sciMatch = input.match(/^(.*)e([+-]?\d+)$/i);
     if (sciMatch) {
         input = sciMatch[1];
-        sci   = BigInt(sciMatch[2]);
+        sci = safeBigInt(sciMatch[2], "exponent");
     }
 
     let [intStr, fracStr] = input.split(".");
     intStr  = (intStr  || "0").replace(/_/g, "");
     fracStr = (fracStr || "").replace(/_/g, "");
 
-    let N = BigInt(intStr);
+    let N = safeBigInt(intStr, "integer part");
     let D = 1n;
 
     if (fracStr.length > 0) {
-        const pow10 = pow10BigInt(BigInt(fracStr.length));
-        N = N * pow10 + BigInt(fracStr);
+        const pow10 = pow10BigInt(BigInt(fracStr.length)); 
+        N = N * pow10 + safeBigInt(fracStr, "fractional part");
         D = pow10;
     }