0c550f3586
Right now the following code will be broken:
```
async function() {
await ref.transaction(
function(foo) {
// deal with foo
},
function(error, committed, ss) {
// additional work on complete callback
},
true
);
// NOTE: Code from here will never execute because promise above never gets resolved
}
```
v2 is not returning at the point of calling onComplete, v3 code does