Subject: [Acme] immutable

From: Josh Soref <[email-masked]>
Date: Sat, 18 Feb 2017 21:51:51 -0500

> The elements of the "authorizations" array are immutable once set.
> The server MUST NOT change the contents of the "authorizations" array after it is created.
> If a client observes a change in the contents of the "authorizations" array,
> then it SHOULD consider the order invalid.

This is an odd use of "immutable". The other two instances of
`immutable` in the document are more traditional.

But here, authorizations is returned by a request. Obviously, the
response data doesn't change while the client is looking at it.

I think what the spec is trying to say is that the conceptual
authorizations for a broader transaction shouldn't change.

But, I don't think that this quoted paragraph does that.