Python 3.12 changed recursion mechanism [1] #1
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sys.setrecursionlimit() and sys.getrecursionlimit(). The recursion limit now applies only to Python code. Builtin functions do not use the recursion limit, but are protected by a different mechanism that prevents recursion from causing a virtual machine crash.
so increasing recursion limit as py-ubjson did [2] makes your package buildable.
[1] https://docs.python.org/3/whatsnew/3.12.html#sys
[2] https://sources.debian.org/src/py-ubjson/0.16.1-3/debian/patches/py12_recursion_PR19.diff/
Origin: https://bugs.debian.org/1058027#10