pyinputplus error with multiple values for arguments

if i try to create input values as a list, it wont function.
E.g. Typing 'c' works, but typing 'a' or 'b' gives an error message.

import pyinputplus as pyip

while True:
prompt = 'Do you want to know how to keep an idiot busy?\n'

response = pyip.inputYesNo(prompt, yesVal=['a', 'b'], noVal='c')

if response == 'a':
print('Ok, this is how you keep an idiot busy !')
break

if response == 'c':
print('Oh well then, have a nice day.')
break

Start at the inputYesNo entry point and reproduce the issue with the example using yesVal=['a', 'b'] and noVal='c'. Trace how multiple yes values are validated and confirm that both 'a' and 'b' are accepted while 'c' remains the no value.

Written by the indexing model from the issue text.