_thread stacks size bug

[troy salt]

In the documentation, it says that the command _thread.stack_size() with no argument returns the thread stack size used when creating new threads. I find that using this command resets the stack size to the default 0.

import _thread
import utime

def printStack():
    tick = 0
    while  True:
        utime.sleep(1)
        print('stack size = {}'.format(_thread.stack_size()))

_thread.stack_size(12288)
_thread.start_new_thread(printStack, ())

printout:

stack size = 32768
stack size = 0
stack size = 0
stack size = 0
....

So it appears the documentation is incorrect, and the command actually resets the stack size to 0.

Bonus question: is there a recommended limit to how large a thread stack size should be? is there any downside in having It large?

Thanks,
Troy