Is a dropped (or altered) function still available inside already opened transactions?

I found - https://dba.stackexchange.com/q/126734/104401 but there are no answers and isn't exactly the same as my question (though very similar). ------- Let's say I do the following: 1. Create a function myfunc() 2. Start a transaction from client A 3. Start a transaction from client B 4. In transaction B, use "create or replace function" to revise the definition of myfunc() 5. Commit transaction B 6. Call myfunc() from transaction A **What happens in step 6?** Am I calling the original function as defined in step 1? Or the modified form from step 4 (committed in step 5)? ----- And if the function is dropped in step 4 rather than being modified, will step 6 fail or succeed? (This is probably the same question but modifications may work differently.) ---- Where is the documentation about this?