pytoolz/cytoolz — pull request #39 by eriknw (2014-06-24 21:39:20+00:00)
Title: Define concat and concatv in itertoolz; don't use aliases.

Previously, we were cheating and doing the following:
```python
concatv = chain
concat = chain.from_iterable
````
This is an artifact from when `cytoolz` was first being developed as proof-of-concept. We should not be cheating or taking shortcuts like this.