fix: support number elements in jsx templates

src/component.ts

@@ -25,7 +25,13 @@ export interface HTMLElement {
 /**
  * All valid types of elements that can be rendered to HTML.
  */
-export type Element = HTMLElement | string | boolean | undefined | null;
+export type Element =
+    | HTMLElement
+    | string
+    | number
+    | boolean
+    | undefined
+    | null;
 
 /**
  * Custom HTMLElement factory that can be parameterized by props.

src/render.ts

@@ -22,6 +22,9 @@ const renderElement = (elem: Element): string => {
     if (elem == null || typeof elem === "boolean") {
         return "";
     }
+    if (typeof elem === "number") {
+        return elem.toString();
+    }
     if (typeof elem === "string") {
         return escapeHtml(elem);
     }