Forgot to mention that this RFC is the result of recent discussions in #429 and at the WG meetings.

Are any changes necessary to GraphQL.js or Sangria to support this?

@leebyron I believe no changes are necessary. RFC permits implementations to have a special treatment for directive order, but does not require it. Also, for all built-in directives, specific order is not important.

This is a very reasonable clarification to the spec. In a project of ours, we actually rely on the order of directive definitions being preserved - which https://github.com/webonyx/graphql-php thankfully does already.

Would be great to have this in to make this an explicitely defined rule that we can depend on.