Both JSON::PP and JSON::XS support boolean_values, and the error message said the method wasn't found in JSON, not JSON::XS.

In reply to Re^4: How do I make the JSON module convert true/false to 1/0 instead of a blessed Boolean object? by ikegami
in thread How do I make the JSON module convert true/false to 1/0 instead of a blessed Boolean object? by Cody Fendant

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