API Error - You must specify a positive value for ports.

I’m a little confused with how the API accepts ports. If I iterate through my current firewalls’ inbound rules, I can see this:

[29] pry(#<DigitalOceanAPI>)> @firewalls["PivotSSH"].inbound_rules
=> [<DropletKit::FirewallInboundRule {:@protocol=>"tcp", :@ports=>"8443", :@sources=>{"addresses"=>["redcacted"], "droplet_ids"=>[redacted]}}>,
 <DropletKit::FirewallInboundRule {:@protocol=>"tcp", :@ports=>"31000-32000", :@sources=>{"addresses"=>["redacted"], "droplet_ids"=>[redacted]}}>]

As you can see above, it looks like the ports is set to “31000-32000” which just looks like a string. However, if I take an existing firewall object and modify its ports to the same thing, the API doesn’t like it when calling the .update function:

[30] pry(#<DigitalOceanAPI>)> firewall
=> <DropletKit::Firewall {:@id=>"redacted, :@name=>"vPenTestAgents", :@status=>"succeeded", :@created_at=>"2020-06-22T03:24:05Z", :@inbound_rules=><DropletKit::FirewallInboundRule {:@protocol=>"tcp", :@ports=>[31000, 32000], :@sources=>{:addresses=>["192.168.1.1"]}}>, :@outbound_rules=>[<DropletKit::FirewallOutboundRule {:@protocol=>"icmp", :@ports=>"0", :@destinations=>{"addresses"=>["0.0.0.0/0", "::/0"]}}>, <DropletKit::FirewallOutboundRule {:@protocol=>"tcp", :@ports=>"0", :@destinations=>{"addresses"=>["0.0.0.0/0", "::/0"]}}>, <DropletKit::FirewallOutboundRule {:@protocol=>"udp", :@ports=>"0", :@destinations=>{"addresses"=>["0.0.0.0/0", "::/0"]}}>], :@droplet_ids=>[redacted], :@tags=>[], :@pending_changes=>[]}>
[32] pry(#<DigitalOceanAPI>)> @client.firewalls.update(firewall)
DropletKit::FailedUpdate: You must specify a positive value for ports.
from /usr/local/rvm/gems/ruby-2.5.8/gems/droplet_kit-3.8.0/lib/droplet_kit/mappings/error_mapping.rb:16:in `fail_with'
[33] pry(#<DigitalOceanAPI>)>

Any idea what could be going on here? It’s weird that I just can’t update the value from what it is currently to the same object type (string) and have it work.

I can’t even take an unmodified firewall and update itself without getting an error about the ports. I can’t understand why this would happen.

If I do something like firewall = client.firewalls.find(id: "xyz"); client.firewalls.update(firewall) then it gives me the same error about the ports. Makes no sense.