Zottel

The only way that worked for me was this: ```Python IPYNB_PREPROCESSORS=[ nbconvert.preprocessors.ExecutePreprocessor(timeout=300), nbconvert.preprocessors.RegexRemovePreprocessor(patterns=['.*PREAMBLE.*'])] ``` Then every cell that contains `PREAMBLE` is executed but removed from the pelican output. Example: ```Python...

Although it would be nice to have all (previous) cells execute when giving `Subcells: [2, None]` in the metadata.

I have a module that causes the same error. It's untested work in progress, so I suspect there are still some directionality conflicts or similar that trigger this. [cache_readonly_dm.txt](https://github.com/nturley/netlistsvg/files/6917392/cache_readonly_dm.txt)

The `gather` function appears to be mostly tail recursive, so rewriting it into a loop without recursion may be the solution.