[issue33979] [Exception message] Display type of not JSON serializable object

Change by Vincent Lefoulon : -- title: Display type of not JSON serializable object -> [Exception message] Display type of not JSON serializable object ___ Python tracker <https://bugs.python.org/issu

[issue33979] Display type of not JSON serializable object

New submission from Vincent Lefoulon : When we call `json.dumps` on a non JSON serializable object, we obtain an error: ``` TypeError: 4 is not JSON serializable ``` Here, 4 was actually a `numpy.int64` object and not a native int. But it is not explicit in the error message. We should