brancher | A rubygem switching databases by Git branch | Database library

I have the following document:

I post here to ask if there is a way to alternate different strategies of branching. Let me explain, I have an efficient branching strategy which we'll call the strategy A. The biggest problem is that the strategy A cannot be used that often. So when I cannot use the strategy A, I use another strategy, which I'll call the strategy B, which is less efficient.

The documentation says that:

Brancher order. Creating a brancher registers it with its home space. A space maintains a queue of its branchers in that the brancher that is registered first is also used first for branching. The first brancher in the queue of branchers is referred to as the current brancher.

So, I supposed that if I post the brancher A then the brancher B, the brancher A will has priority and each time the status of A says there is no branching to do, the brancher B will be used. Seems like I was wrong because when the status of a brancher return false, it is never called again. Here is a "minimal example":

When I try to load google api client on apple devices, mobile or otherwise, it gives me an error and never calls the callback. However the problem does go away when an account is logged in. It appears on chrome simulating apple mobile devices, it appears on apple devices themselves, like iphone and macbook.