Negative half of the wrapper tests above (which never feed one invalid input): each reject is asserted on an error-message SUBSTRING, not bare is_err(), so a rejection can't pass for the wrong reason (e.g. a parse hiccup instead of the bound). The is_ok() baselines are the positive tests above, which accept the same shapes with one dimension fixed.
(json: &str, needle: &str)
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nothing calls this directly
no outgoing calls
no test coverage detected