Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18277
So, after this change, we will get rid of system default roundtrip in
**When `obj`: `unicode`** and **When `obj`: other types**.
In case of **When `obj`: other types**, we _might_ have a behaviour change
if `__unicode__()` is defined differently with `__str__()` but I believe it's
quite rare.
So, LGTM but I want a double check from you @holdenk and @viirya if I
missed anything.
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