Get multiple ports via number option

[silverwind]

I'd like to get two or more free ports in the full range of ports with the assignment mechanism than getPort().

Now there is getPort.makeRange(1024, 65535) and calling .next() multiple times achieves a similar result but it's not exactly the same as getPort() because ports are assigned sequentially from the start argument.

I'd suggest a number option that that if passed changes the signature of the return value to an Array of port.

[silverwind]

Actually, it seems getPort() may already be suitable if it can guarantee that it will never return the same port on subsequent calls:

> await getPort()
51161
> await getPort()
51162

Is this guarantee true? What happens if the port space is exhausted?

[silverwind]

Actually, I think I can answer myself. It should reject if port space is exhausted (.listen will fail).