what does directive decorator `cython.internal` do? is it deprecated?

[raceychan]

As I glance through some of the libs that uses cython for learning purpose, i noticed that 

some classes are decorated with 

```python

@cython.internal
cdef class SomeClass:

```

However, I am not able to find the documentation for this decorator, also, is there any documentation for directive decorators? I serached it with google as well as official documentation of cython, no results.

Any help is appreciated! thanks

[da-woods]

They don't get added to the module dictionary so are only available from within Cython and not from Python code.

Most of the directives are documented here https://cython.readthedocs.io/en/latest/src/userguide/source_files_and_compilation.html#compiler-directives; a few class-specific ones are documented https://cython.readthedocs.io/en/latest/src/userguide/extension_types.html (e.g. `no_gc`). It's possible that `internal` is undocumented.

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