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I would say filename/lineno are excluded from hash on purpose because
they are ignored in comparisons:
>>> compile("0", "a", "eval") == compile("0", "b", "eval")
True
Include/code.h has the following comment:
 /* The rest doesn't count for hash/cmp */ 
 PyObject *co_filename; /* string (where it was loaded from) */ 
 PyObject *co_name; /* string (name, for reference) */ 
 int co_firstlineno; /* first source line number */ 
..
Can you describe your specific problem in more detail? Why does your
debugger need to hash/compare code objects?