I have some questions though, since I'm also interested to build a toy virtual machine for the sake of knowledge.
Which resources did you use?
How long did it take for you to build this? As I can't grok much based on the commit history.
As for resources first I made a interpreter which is also on my github just out of head without googling anything to see how far I could come with the knowledge I had, then after that for some feature I wanted to add a interpreter wasn't the best fit and a VM would be better, so I decided to rewrite it and change the interpreter to a compiler of sorts and write a VM which I searched for articles on VM/Compilers and stuff.