Does order of servers in nginx config matter?

I have a custom tool which generates a part of nginx config in the following form, for example:

upstream  backend  {
  ip_hash;
  server server1:8080;
  server server2:8080;
  server localhost:8080 backup;
 }

From time to time some servers go down, some go up and the next update could produce following:

upstream  backend  {
  ip_hash;
  server server1:8080;
  server server3:8080;
  server server2:8080 down;
  server localhost:8080 backup;
 }

As you can see, server3 has appeared and server2 is marked down. My question is following: does nginx care the order of servers presented in config? Do I need to sort output of my custom tool?

In this example the initial order was changed and I don't know if nginx will handle it correctly.