Use pointer receiver for Key

[Freeaqingme]

While debugging an issue I added the pointer receivers. I'm not sure if that's what made the difference, but it seems a good improvement nonetheless.

[prep]

Hey Dolf,

Apologies for the late reply.

Are you saying this solves a problem you were having, or are just preferring the aesthetics of having the methods on Key be pointer receivers? If it's the latter, I'm not against it per se, but none of those methods change the state of the Key so making them value receivers made more sense to me.

[Freeaqingme]

Are you saying this solves a problem you were having

That I'm not sure about anymore :)

Advantages of using pointer receivers is that otherwise the struct would be copied for every method invocation. There was a nice blogpost that I'm thinking of but can't find it right now.