How to get a list of frames available to Casperjs?

Question

PhantomJS

Good afternoon
I use casperjs
There is a page on which there are 5-8 iframes - absolutely "impersonal" - that is, the bottom has neither id nor name attributes
, Casper has the ability to "go" inside the frame using the command

this.withFrame(3, function(){
   // inner code
});

In order for Casper to understand - which frame I want to get into - I give him a serial number (in the example it is number 3)
Question:
How can I look at the entire array of available frames?