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[ENH] Generate exception monitoring events

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### Is your feature request related to a problem? Please describe. Cython could emulate the `sys.monitoring` events `RAISE`, `C_RAISE`, `RERAISE`, `EXCEPTION_HANDLED`. See https://docs.python.org/3/library/sys.monitoring.html with some additional explanation here: https://github.com/python/cpython/issues/118360 ###...

Add warnings about "obviously unintended" code

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There is an [interesting discussion](https://mail.python.org/pipermail/python-dev/2019-January/156113.html) on the python-dev mailing list about issuing more warnings from the CPython compiler about code that will lead to errors at runtime (if executed). Serhiy...

### Is your feature request related to a problem? Please describe. We have replacement implementations for `.startswith()` and `.endswith()`, for both `bytes` and `unicode`. We could do even more. ###...

### Describe the bug The visitor classes in `Visitor.py` define some final methods in order to inline the calls. This works inside of one class but not across subtypes. I...

Namespace-only named cpdef enums

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No longer copy the items of names cpdef enums to the module namespace. Keep this behaviour for the items of anonymous enums and public/api enums. Closes https://github.com/cython/cython/issues/4571

### Describe your issue [PEP-743](https://peps.python.org/pep-0743/) suggests introducing a CPython macro for a C-API compatibility version. If this makes it into CPython, it'd probably something to integrate into our version specific...

Document how to embed Cython modules in C/C++ applications

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The documentation on embedding is inherently lacking. Even the one in the [CPython docs](https://docs.python.org/3/extending/embedding.html) is incomplete at best. There are some hints [in the Wiki](https://github.com/cython/cython/wiki/EmbeddingCython), there's the `--embed` option to...

[BUG] GraalPython dislikes fake byte code in CodeObjects

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### Describe the bug Several tests (e.g. import related ones) currently fail in GraalPython while setting up the code objects during import: ``` ValueError: Bytecode version mismatch, expected 29 actual...

Warn about unraisable exceptions where they occur

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Cython currently warns about function that cannot propagate the exceptions raised in their body. Often, this is because the function was accidentally declared without `except` clause. But in some cases,...

Compress module strings as concatenation

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Rewrite the string storage to use compressed concatenated strings and an index to slice them into the final user strings. Allow users to chose between zlib and bzip2 compression. Supersedes...