fix 'Maximum call stack size exceeded'

packages/core/util.mjs

@@ -339,8 +339,13 @@ export function uniqsortr(a) {
 
 export function unicodeToBase64(text) {
   const utf8Bytes = new TextEncoder().encode(text);
-  const base64String = btoa(String.fromCharCode(...utf8Bytes));
-  return base64String;
+  let binaryString = '';
+  const chunkSize = 0x8000;
+  for (let i = 0; i < utf8Bytes.length; i += chunkSize) {
+    const chunk = utf8Bytes.subarray(i, i + chunkSize);
+    binaryString += String.fromCharCode.apply(null, chunk);
+  }
+  return btoa(binaryString);
 }
 
 export function base64ToUnicode(base64String) {

website/src/repl/useReplContext.jsx

@@ -109,7 +109,12 @@ export function useReplContext() {
         // Get the full buffer content from the editor instead of just the evaluated block
         const fullBufferCode = editorRef.current?.code || code;
         setLatestCode(fullBufferCode);
-        window.location.hash = '#' + code2hash(fullBufferCode);
+
+        try {
+          window.location.hash = '#' + code2hash(fullBufferCode);
+        } catch (e) {
+          console.warn('[useReplContext] Failed to update hash:', e.message);
+        }
         setDocumentTitle(fullBufferCode);
         const viewingPatternData = getViewingPatternData();
         setVersionDefaultsFrom(fullBufferCode);