buffer: correct indexOf() error message

PR-URL: https://github.com/nodejs/node/pull/29217
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

lib/buffer.js

@@ -907,7 +907,7 @@ function bidirectionalIndexOf(buffer, val, byteOffset, encoding, dir) {
   }
 
   throw new ERR_INVALID_ARG_TYPE(
-    'value', ['string', 'Buffer', 'Uint8Array'], val
+    'value', ['number', 'string', 'Buffer', 'Uint8Array'], val
   );
 }