No way to close a namespace (since v3)?

[TotallyInformation]

It used to be possible to get rid of a namespace up until socket.io v3 (using delete server.nsps['/namespace']).

I cannot find any method to do this now.

I have an application where namespaces can be created dynamically because the application is creating new web apps dynamically and each web app needs a separate namespace (with separate comms, security, etc).

When such a web app is deleted from the master application, I need to free the memory consumed by the namespace. The user may also wish to recreate a webapp with the same name (and therefore the same namespace) but it may have different settings.

So how can I tidy up the namespaces?

Thanks.