Terry, if you'd like to continue that discussion, please open a new enhancement request for 3.8+ against the inspect module asking for the affected introspection functions to recursively search for relevant attributes, the same way `inspect.signature` digs inside different object types to look for signature information.

However, the fact the inspect module doesn't implement that search for relevant attributes today is *not* a bug - it's a past design decision that could potentially stand to be revisited.

By contrast, the fact the affected functions throw AttributeError instead of returning False for a missing attribute *is* a bug.