When caching function's extractors use more stable key into the extractors_cache.
The id() of function object is not nessesary unique, as CPython may re-use same memory in case function object is un-referenced. This situation happens when Database objects are dynamically created and destored in the same process.
If a new different function object function is instantiated at the old address, we'll get wrong entry from extractors_cache.
The function's code object id() is more stable. By including code object id() into the cache key this issue is solved.
When caching function's extractors use more stable key into the extractors_cache.
The id() of function object is not nessesary unique, as CPython may re-use same memory in case function object is un-referenced. This situation happens when Database objects are dynamically created and destored in the same process.
If a new different function object function is instantiated at the old address, we'll get wrong entry from extractors_cache.
The function's code object id() is more stable. By including code object id() into the cache key this issue is solved.
Solves: https://github.com/ponyorm/pony/issues/675