substack/node-seq — pull request #36 by dordille (2012-10-09 21:23:26+00:00)
Title: Added ability to use Seq.vars like Seq in arguments list

This commit makes it possible to reference the future values of context.vars from within the signature of a step in the chain.

Usage as follows.

```js
var Seq = require('seq');

Seq()
.seq('foo', someFunction, Seq)
.seq(otherFunction, Seq.vars('foo'), Seq);
```

Open to suggestions on ways to improve the implementation, but the functionality itself has been useful for me.