Fix frontmatter indexing error when a tag is a number (#830)

* Fix indexing error by always treating frontmatter tags as strings

* Only try escaping html in actual strings

plug-api/lib/frontmatter.ts

@@ -115,8 +115,18 @@ export async function extractFrontmatter(
     return undefined;
   });
 
-  // Strip # from tags
-  data.tags = [...new Set([...tags.map((t) => t.replace(/^#/, ""))])];
+  try {
+    data.tags = [
+      ...new Set([...tags.map((t) => {
+        // Always treat tags as strings
+        const tagAsString = String(t);
+        // Strip # from tags
+        return tagAsString.replace(/^#/, "");
+      })]),
+    ];
+  } catch (e) {
+    console.error("Error while processing tags", e);
+  }
 
   // console.log("Extracted tags", data.tags);
   // Expand property names (e.g. "foo.bar" => { foo: { bar: true } })

plugs/markdown/html_render.ts

@@ -7,6 +7,10 @@ export type Tag = {
 } | string;
 
 function htmlEscape(s: string): string {
+  if (typeof s !== "string") {
+    return s;
+  }
+
   s = s.replace(/&/g, "&")
     .replace(/</g, "&lt;")
     .replace(/>/g, "&gt;")