@toots What would be the logistics of handling this in an on_metadata function? 
As far as I know, the on_metadata function only receives the updated metadata 
as an argument and can't manipulate the metadata on the fly.

Basically, I'm looking for something akin to:

```
def handle_jingle_mode(m) = 
  if (m["jingle_mode"] == "") then
    log("Jingle mode; stripping metadata...")
    []
  end
  m
end
radio = 
map_metadata(handle_jingle_mode,update=false,strip=true,insert_missing=false,radio)
```

...but the above throws this error:

```
At line 57 char 31 - line 59 char 6:
  this value has type
    (...)->[_]
  but it should be a subtype of
    (...)->unit
```

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