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']

使用提供的輸入和查詢在 Python 實作中重現此問題，然後將其結果與 playground 的輸出進行比較。追蹤 flatten() 如何處理字串，並為此情況新增回歸測試。當 Python 結果與 playground 一致時即完成：["foo", "bar"]。