Flatten flate strings as well

unlike the playground in python the flatten function flate the strings here the output from the playground vs the output from python of the same query and input data.
input:
["foo", "bar" , [{"text":"buz qux"}]]
query: 
flatten() | filter(not(exists(.text)))
1 - playground:
["foo", "bar"]
2- python:
['f', 'o', 'o', 'b', 'a', 'r']
