[knome]

closures and objects with a single invoke() method have been considered equivalent in many views for some time.

[deepsun]

Exactly, that's why I disagree with parent's comment:

> If there's anything that is not an object, it's a function!

[Jtsummers]

Functions aren't closures. To be a closure it needs to be a function paired with an environment. Functions do not inherently carry their environment with them.