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Currently, the subdirs attribute of filecmp.dircmp does not respect subclassing:
>>> from filecmp import dircmp
>>> class MyDirCmp(dircmp):
... pass
... 
>>> my_dcmp = MyDirCmp('dir1', 'dir2')
>>> for item in my_dcmp.subdirs.values():
... print(type(item))
... break
... 
<class 'filecmp.dircmp'>
This is the only place where dircmp does not respect subclassing. It can be corrected here:
def phase4(self): # Find out differences between common subdirectories
 ...
 ...
 self.subdirs[x] = dircmp(a_x, b_x, self.ignore, self.hide)
This would let one do things like override dircmp.report() and have dircmp.report_full_closure() behave as expected.