Can't Create a Custom Kernel Extension

The package and version I’m asking about: 1.0.251301+06badd73c27d2c2065cf835ab7bd65bccd2339ee

Question

I’m trying to create a custom extension, using the ClockExtension example as a guide. You can find my code here - specifically, it’s the Collatz.Interactive project. I created a notebook to test it out - DemoExtension.ipynb. When I run it…it finds the local NuGet package, but running the help command (-h) doesn’t produce anything, and when I try to run it, I get this error:

Error: Required command was not provided.
Unrecognized command or argument '#!collatz'
Unrecognized command or argument '-s'
Unrecognized command or argument '444'

I’m not sure what I’m doing wrong. Any insight is appreciated - TIA.

[JasonBock]

Finally! Success 😃 @jonsequitur thanks for the help.

[jonsequitur]

This error is because the parameter binding in System.CommandLine is making a best attempt at satisfying the BigInteger constructor but can’t instantiate the ReadOnlySpan<byte>. You can probably solve this by providing a ParseArgument<T> delegate to your Option<BigInteger>.