fix: migrate

lib/migrate.ts

@@ -2,7 +2,14 @@ import mdastV6 from './mdastV6';
 import mdx from './mdx';
 
 const migrate = (doc: string, { rdmd }): string => {
-  return mdx(mdastV6(doc, { rdmd })).replaceAll(/ /g, ' ');
+  return (
+    mdx(mdastV6(doc, { rdmd }))
+      .replaceAll(/ /g, ' ')
+      // @note: I'm not sure what's happening, but I think mdx is converting an
+      // 'a' to 'a' as a means of escaping it. I think this helps with
+      // parsing weird cases.
+      .replaceAll(/a/g, 'a')
+  );
 };
 
 export default migrate;