[3.7] bpo-39142: Avoid converting namedtuple instances to ConvertingTuple. (GH-17773) #17786
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This uses the heuristic of assuming a named tuple is a subclass of
tuple with a _fields attribute. This change means that contents of
a named tuple wouldn't be converted - if a user wants to have
ConvertingTuple functionality from a namedtuple, they will have to
implement it themselves.
(cherry picked from commit 46abfc1)
Co-authored-by: Vinay Sajip [email protected]
https://bugs.python.org/issue39142