[issue41097] confusing BufferError: Existing exports of data: object cannot be re-sized

[PEW's Corner]

PEW's Corner <pewscorner at gmail.com> added the comment:

I'm getting the same error (in 3.8.3) for this code:

o = bytearray(1)
o += o

There's no error if the second line is replaced with:

o += bytearray(1)

Not sure if this is related.

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nosy: +pewscorner

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<https://bugs.python.org/issue41097>
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