[issue26766] The result type of bytearray formatting is not stable

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Hmm, looks the result type is very unstable.

On release build:

>>> bytearray(b'hello %b') % b"world"
b'hello world'
>>> bytearray(b'hello %b') % b"wor"
b'hello wor'

On debug build:

>>> bytearray(b'hello %b') % b"world"
bytearray(b'hello world')
>>> bytearray(b'hello %b') % b"wor"
b'hello wor'

And current test_bytes.py is passed on release build, but is failed on debug build.

----------
priority: normal -> high
stage: commit review -> 
title: Redundant check in bytearray_mod -> The result type of bytearray formatting is not stable

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26766>
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