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Niels Lohmann
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The copy constructor descends into 128 levels before it finishes a value without the call stack, so the iterative path is otherwise only reached by the few tests that nest deeper than that. JSON_NO_THREAD_LOCAL switches the descent off, which sends every value down that path. Running the whole test suite that way covers it with every object type, string type, allocator, and base class the suite already exercises. The new ci_test_no_thread_local target does that; the macro had no build coverage at all before. Copying a nested value also has to carry over what the element-wise copy constructor would have copied: the parents that JSON_DIAGNOSTICS relies on, and the positions that JSON_DIAGNOSTIC_POSITIONS reports. Both are now checked on either side of the descent bound, for objects and arrays. Neither was tested before, and dropping either one makes the new tests fail. Also quantify what JSON_NO_THREAD_LOCAL costs a copy instead of calling it "measurably slower". Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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