what will happen to the binary log if it reaches its maximum value ? Does it reset to mysql-bin.00001 again?

what will happen to the binary log if it reaches its maximum value ? Does it reset to mysql-bin.00001 again ?

I know the below points exist means, there won't be any reset happen in binlogs.

1. 
   

   I would like to know whats the maximum value for the bin-log files.

   
   


2. 
   

   In case, the expire_log_days not provided, then it should not replace the first file, throws 'file-exist' error. The logs will be kept forever unless you specify an expiry.

   
   


3. 
   

   If the binary log master index files having the entry, I don't think it will replace.

   
   

Then what will happen eventually?