Must a type explicitly declare that it implements an interface? *Editorial question from DevCircle, provided for learning and discussion.*

I want cleanup to run when a function exits. When are deferred calls executed? *Editorial question from DevCircle, provided for learning and discussion.*

How can I run a function concurrently, and does it get its own operating-system thread? *Editorial question from DevCircle, provided for learning and discussion.*

A function returns both a value and an error. What should the caller do? *Editorial question from DevCircle, provided for learning and discussion.*

Why do functions usually accept slices rather than fixed-length arrays? *Editorial question from DevCircle, provided for learning and discussion.*