Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

[Dong-hee Na]
> However, since the type is the structsequence the 
> change can cause the ValueError: too many values 
> to unpack when the variable is used as a tuple

Structseq also allows named fields that aren't part of the tuple.  That is why 
I suggested, "consider adding new non-sequence fields ..."

For example, the Posix stat result struct seq has optional fields (
st_blksize, st_blocks, st_rdev, and st_flags) that are available as attributes 
only.

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<https://bugs.python.org/issue41823>
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