orderBy of columns with mixed types
<p>Can you tell how to use orderBy for objects with various field types (strings and numbers)?
For example</p>

<pre><code>_.orderBy([{a: 3}, {a: 2}, {a: 'a'}, {a: 1}, {a: 'c'}, {a: 'b'}], ['a'], ['asc'])
</code></pre>

<p>I've got</p>

<pre><code>[{"a":2},{"a":3},{"a":"a"},{"a":1},{"a":"b"},{"a":"c"}]
</code></pre>

<p>but how can I get something like</p>

<pre><code>[{"a":1},{"a":2},{"a":3},{"a":"a"},{"a":"b"},{"a":"c"}]
</code></pre>