Handler that wraps an untrusted thenable and assimilates it in a future stack
new Async.Thenable(then, thenable)
Handler that wraps an untrusted thenable and assimilates it in a future stack
Parameters
- 
			then{function()}
- 
			thenable{Object}
Handler that wraps an untrusted thenable and assimilates it in a future stack
Handler that wraps an untrusted thenable and assimilates it in a future stack
{function()}{Object}