Attached is a sample program which works on 3.9 but fails linking with 3.10.0a2
The .so is missing the symbol:
igor@LAPTOP:~/py_limited_api_example$ nm /home/igor/lib/libpython3.9.so | grep Py_CompileString
0000000000212720 T Py_CompileString
000000000020fe30 T Py_CompileStringExFlags
0000000000212730 T Py_CompileStringFlags
000000000020fd40 T Py_CompileStringObject
igor@LAPTOP:~/py_limited_api_example$ nm /home/igor/lib/libpython3.10.so | grep Py_CompileString
0000000000201a40 T Py_CompileStringExFlags
0000000000201980 T Py_CompileStringObject
Please stop breaking the Stable ABI :/