Jupyter integration conflicts with variable type converters from other integrations.

[ark-1]

Steps to reproduce

Cell 1:

notebook.fieldsHandlersProcessor.register(
    // replacing all byte array variables with lists
    extension = FieldHandlerFactory.createUpdateHandler<ByteArray>(TypeDetection.COMPILE_TIME) { _, prop ->
        execute("${prop.name}.toList()").name
    },
)

Cell 2:

%use dataframe
val x = ByteArray(1)

Cell 3:

x.javaClass

Expected output:

class java.util.Collections$SingletonList (that means that the byte array was transformed into a list as we asked it to in the fieldsHandlersProcessor).
You can also get this output by commenting out %use dataframe, restarting the kernel and rerunning the notebook.

Actual output:

class [B (the byte array stayed byte array).

[Jolanrensen]

probably related to #401