My code will break when the join() function is replaced by experimental.join()

According to [this ](https://docs.influxdata.com/influxdb/v2.0/reference/flux/stdlib/experimental/join/)link

> The [experimental.join()](https://docs.influxdata.com/influxdb/v2.0/reference/flux/stdlib/experimental/join/) function will likely replace the [join()](https://docs.influxdata.com/influxdb/v2.0/reference/flux/stdlib/built-in/transformations/join/) function when sufficiently vetted.

The problem is going to be that the experimental.join() function forces you to join on *_time*.

WHY ???

My current use does not join on _time. It joins on a custom field. In fact it’s critical that I don’t join on _time for what I’m doing.
What am I doing? I’m adding a product code to a table of timed data. The product code links _field with a _code. But the table with the _code value has 0 as the time because it covers all-time. Therefore I want to join on a _code **NOT** _time.

So please please either add the same flexibility to the experimental.join() function. Or commit to keeping both permanently.

Cheers