Cannot round-trip UCS-2 with unpaired surrogates using UTF-16 and surrogateescape
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topic-unicode
- Dominant language
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Description
Bug report
The following Python code throws a UnicodeEncodeError:
b'\xdc\xff'.decode('UTF-16BE', 'surrogateescape').encode('UTF-16', 'surrogateescape')
I would expect that it would return b'\xdc\xff' instead.
Your environment
- CPython versions tested on: 3.10.4 from Fedora 35 repository
- Operating system and architecture: Fedora 35 on x86-64
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Research direction
Start by running the reported UTF-16BE decode and UTF-16 encode snippet on the stated CPython version, then trace the relevant encoding and surrogateescape behavior. Done means the bytes b'\xdc\xff' round-trip without a UnicodeEncodeError, with behavior checked against the reported expectation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- internationalization
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 35/100