How to: specify SCI :classes

[vemv]

Context

I'd need to be able to run code such as this one, namely that uses arbitrary classes.

(malli/coerce [:fn '(fn url? [s]
                      (try
                        (java.net.URL. url)
                        true
                        (catch MalformedURLException _
                          false)))]
              "http:")

...This is safe for my use case, as I'm using SCI for serializable functions - not for evaluating user input.

Problem statement

The code above won't run since no classes are whitelisted by default.

Suggested solution

Allow to specify {:classes {:allow :all}} as documented in:

https://github.com/babashka/sci/blob/bf6a0f1e00313a902c62c59e440266612725b926/README.md#classes

...perhaps this is possible already, but there wasn't documentation for this aspect. Code wasn't immediately clear to me.

Thanks - V