Thank you for having a look at it! I didn't know extism, will definitely have a look at the readme right after I finish to write this comment.

The ctx variable is a piece of memory, kind of the heap where functions and variables are stored during the script execution; I did it that way because I wanted to keep whatever is in that memory after each script execution, so in a prior version you could define a variable x, run the script, then re-run a completely different script, but still have access to the x variable. I removed it at the end because I wasn't sure if it was a good idea, or at the very least should be documented, but I kept the ctx thing there (could easily remove it tho)