Send a value to the async generator and resumes execution of the generator
public function send( ?Ts $v, ): Awaitable<?(Tk,Tv)>
You should always
await the returned
Awaitable to get the actual
null is returned, that means you have reached the end of iteration.
You cannot call
send() without having the value returned from a previous
raise(), having first
$v- The value to send to the async generator.