Behavior of infer when function name clashes with brain

Sorry if this is a dumb question. I have the following code:
```python
import astroid
node = astroid.extract_node(
"""
def sample(a, b=None):
return a
sample([1, 2, 5, 6], 2) #@
"""
)
inferred = next(node.infer())
elems = sorted(elem.value for elem in inferred.elts)
```
After inferring the return value to the `sample` call, the `elems` returned a list that contained 2 values, whereas it should be `[1, 2, 5, 6]` in this case. I understand that probably [random brain](https://github.com/PyCQA/astroid/tree/master/astroid/brain) has something to do with it, but why this behavior is the default even though `random` module was never imported?

Reproduce the behavior with the supplied astroid.extract_node snippet and compare the inferred result with the expected list. Then inspect how astroid.brain handles the random-related inference when no random import exists. Done means the behavior is explained and inference no longer selects the conflicting interpretation without an import, with a regression test covering the example.

Written by the indexing model from the issue text.