Blank array not flattened!

I'm using flat module for preparing object to store data in Redis DB. (Redis doesn't allow array and nested object )
Now, the Issue is Flat doesn't do anything to blank array.
E.g.
```
{
a: [],
a1: {
a11: 1
}
b: 'test',
c: 12
}
is flatten to
{
a: [],
a1.a11: 1,
b: "test",
c: 12,
}
```

this gives me error on Redis. Can Flat module help me with this?