Martin Panter added the comment:
Hi Victor, I’m not sure about changing the data type. As Python 3 grows older,
there is potentially more code being written that you break by fixing a bug
like this. It is incompatible if you used to write
>>> print(struct.Struct('hi').format.decode())
hi
I have used this decode() trick in the past to build composite format strings;
e.g.: <https://bugs.python.org/issue16349#msg174083>. If you change the data
type this code will raise AttributeError. At a minimum you should acknowledge
it in the “porting” section of What’s New.
Also, if you make this change, maybe update the module doc string. See the end
of format-str.patch.
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