File

util.pubsub: Signal that 'persistent-items' is unsupported when disabled XEP-0060 says that this the way to indicate that 'persistent-items' is unsupported, but doesn't explicitly say if it being disabled in the node configuration also counts as unsupported.

local xpcall = xpcall;

if select(2, xpcall(function (x) return x end, function () end,  "test")) ~= "test" then
	xpcall = require"util.compat".xpcall;
end

return {
	xpcall = xpcall;
};