escape double quote issue at ansible 1.9.3

[jack]

Hi, All

We have the ansible task similar like this, which works fine at ansible 1.5

    - name: set fact

      set_fact: option="--op \"type eq 'db'\""

At 1.5, the option was set to 

    --op "type eq 'db'"

But after we upgrade ansible to 1.9.3, the option fact is set to

    --op \"type eq 'db'\" 

So it looks like that at 1.9, the escape logic has been changed. What is the correct way to escape the double quotes?

Thanks

Jack