This is a concurrent library, but not thread safe?

[Chuck Fan]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

Expected behavior
A clear and concise description of what you expected to happen.

Code or Screenshots
If applicable, add a minimal and self contained code example or screenshots to help explain your problem.

def foo(self) -> str:
    return 3

Additional context
Add any other context about the problem here.

• OS [e.g. Windows]
• RxPY version [e.g 4.0.0]
• Python version [e.g. 3.10.2]