Change DigitalCredential.data's type to 'any' (#107)

* Change DigitalCredential.data's type to 'any'

* Update index.html

index.html

@@ -237,7 +237,7 @@ <h2>
     [Exposed=Window, SecureContext]
     interface DigitalCredential : Credential {
       readonly attribute DOMString protocol;
-      [SameObject] readonly attribute Uint8Array data;
+      readonly attribute any data;
     };
     </pre>
     <h3>
@@ -251,9 +251,22 @@ <h3>
     <h3>
       The `data` member
     </h3>
+    <aside class="issue" title="Why the 'any' data type?">
+      <p>
+        We are currently exploring the use of a more structured data type for
+        the `data` attribute as we attempt to understand the requirements of
+        various digital credential formats and protocols. <strong>We expect
+        this data type to change in the very near future.</strong>
+      </p>
+      <p>
+        We are also investigating how [[[webauthn]]] deals with this. See
+        <a href="https://github.com/WICG/digital-identities/issues/95">issue
+        #95</a>.
+      </p>
+    </aside>
     <p>
       The <dfn data-dfn-for="DigitalCredential">data</dfn> member is the
-      credential's encrypted data.
+      credential's response data.
     </p>
     <h2 id="protocol-registry">
       Registry of protocols for requesting digital credential