Need help with assigning priority to wifi network

Hello Community,

I’m trying to configure multiple wifi networks to my wlan0 using vintage_net.
I want understand more about assigning priority to the networks. I was able to set priority and observed that network with higher priority is selected. Sharing an example i used

VintageNet.configure("wlan0", %{
  type: VintageNetWiFi,
  vintage_net_wifi: %{
    networks: [
      
      %{
        ssid: "TestWifi1",
        psk: "Test1234567",
        key_mgmt: :wpa_psk,
        priority: 2
      },
      %{
        ssid: "TestWifi2",
        psk: "Test1234567@sor",
        key_mgmt: :wpa_psk,
        priority: 1
      }
    ]
  },
  ipv4: %{method: :dhcp}
})

Referring to above example, I observed wlan0 get connected to TestWifi1
I do have few question related to this

1. Is there any limit to priority
2. Is there any other method to assign priority
3. priority should always be integer? or it can be string?
4. I was not able to find any documentation related to this, if someone can point me to any documentation

Thanks & Regards