[docs] [issue18840] Tutorial recommends pickle module without any warning of insecurity

[Fred L. Drake, Jr.]

Fred L. Drake, Jr. added the comment:

Advising the reader to be aware of the security warnings in the API documentation seems sufficient.

JSON isn't intended to support arbitrary data, and that's what this section is discussing.  Another section about data interchange with other applications (regardless of language), may be a reasonable addition, or a good candidate for a separate How-To document that can be referenced.

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nosy: +fdrake

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