> Another idea: RSpec::Core::MemoizedHelpers -- since both let and subject define memoized helper methods.

The full API this module adds, is:

```
#subject
#should
#should_not
.let
.let!
.subject
.subject!
.its
```

So it's not only about memoization...how about `ShorthandSyntax`? Nah, doesn't sound good, too :).

Ok, I'll call it `MemoizedHelpers` for now.

> I don't consider the constant names for the Let and Subject modules to be part of the public API

Cool :).