Issue #215 - Make Swift Enums conform to Hashable

[bclymer]

What

Makes enums conform to Hashable. The actual conformance is automatically synthesized by the Swift 4.1 compiler.

Why

In response to apollographql/rover#215

Testing

In my local environment I was able to verify simply adding Hashable worked as expected, and it could be used in external code as if it was Hashable. As long as CI's tests pass, this should be good to go.

Problems

Swift 4.1 only exists in Xcode 9.3, and not 9.2 or below. From what I can see, Apollo still supports "Xcode 9 and Swift 4", so that will no longer be completely true. However, Swift 4.1 is a non-source-breaking change, and having enums automatically implement Hashable is a nice win.

• feature
• blocking
• docs

[apollo-cla]

@bclymer: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Meteor Contributor Agreement here: https://contribute.meteor.com/

[bclymer]

@meteor-bot done.

[martijnwalraven]

Thanks, this definitely seems worth adding. I don't have any concerns about not supporting Xcode 9.2 and below, because all developers should be on the latest version to be able to submit apps to the store.