I'm not sure where else to post this, but in this, you have a typo:

Another cool feature of O is that the stack contents will pe outputted when the code finishes execution. Meaning 1234 will output 1234, while 1234oooo will output 4321. This feature does not work in the REPL.

Should be

Another cool feature of O is that the stack contents will be outputted when the code finishes execution. Meaning 1234 will output 1234, while 1234oooo will output 4321. This feature does not work in the REPL.

Also, your double accent marks break the ReadTheDocs site (i.e. they don't work)