Decorators for functions

[Yongxu Ren]

Alex,

```
const fibonacci = memoize(function(n) {...});
```

this is actually a very good example that why we should let decorator do
the job.

Regardless the name ```memoize``` or memorize, whatever,

How can you tell if fibonacci is a function, a list, or just a number?

That is why we should allow decorator on function
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