toString children of title

Author: sebmarkbage

packages/react-dom-bindings/src/client/ReactDOMFloatClient.js

@@ -587,17 +587,27 @@ export function getResource(
       return null;
     }
     case 'title': {
-      let child = pendingProps.children;
-      if (Array.isArray(child) && child.length === 1) {
-        child = child[0];
+      const children = pendingProps.children;
+      let child;
+      if (Array.isArray(children) && children.length === 1) {
+        child = children[0];
+      } else {
+        child = children;
       }
-      if (typeof child === 'string' || typeof child === 'number') {
+      if (
+        typeof child !== 'function' &&
+        typeof child !== 'symbol' &&
+        child !== null &&
+        child !== undefined
+      ) {
+        // eslint-disable-next-line react-internal/safe-string-coercion
+        const childString = '' + (child: any);
         const headRoot: Document = getDocumentFromRoot(resourceRoot);
         const headResources = getResourcesFromRoot(headRoot).head;
-        const key = getTitleKey(child);
+        const key = getTitleKey(childString);
         let resource = headResources.get(key);
         if (!resource) {
-          const titleProps = titlePropsFromRawProps(child, pendingProps);
+          const titleProps = titlePropsFromRawProps(childString, pendingProps);
           resource = {
             type: 'title',
             props: titleProps,

packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js

@@ -1463,8 +1463,14 @@ function pushTitleImpl(
     Array.isArray(children) && children.length < 2
       ? children[0] || null
       : children;
-  if (typeof child === 'string' || typeof child === 'number') {
-    target.push(stringToChunk(escapeTextForBrowser(child)));
+  if (
+    typeof child !== 'function' &&
+    typeof child !== 'symbol' &&
+    child !== null &&
+    child !== undefined
+  ) {
+    // eslint-disable-next-line react-internal/safe-string-coercion
+    target.push(stringToChunk(escapeTextForBrowser('' + child)));
   }
   target.push(endTag1, stringToChunk('title'), endTag2);
   return null;