I already pointed out a while ago that the separator could be the & and
the returning value is either an address or an array of addresses.
So no comma or other delimiter needed.
also I would suggest to call the parameter `address` and not a shortcut
for it as we are used to `message` and `amount` spelled out as well.

On 18.10.2018 16:20, Clark Moody via bitcoin-dev wrote:
> Since we don't know what sort of address changes will happen later on, you
> could make this future-proof by passing a list of addresses to `addr`.
> 
> The syntax is
> 
> bitcoin:<address>[?addr=<address>[,<address>[,<address>]]]