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Changes

• Add JsonVariant::shallowCopy() (issue #1343)
• Fix 9.22337e+18 is outside the range of representable values of type 'long'
• Fix comparison operators for JsonArray, JsonArrayConst, JsonObject, and JsonObjectConst
• Fix lax parsing of true, false, and null (issue #1781)
• Remove undocumented accept() functions
• Rename addElement() to add()
• Remove getElement(), getOrAddElement(), getMember(), and getOrAddMember()
• Remove undocumented JsonDocument::data() and JsonDocument::memoryPool()
• Remove undocumented JsonArrayIterator::internal() and JsonObjectIterator::internal()
• Rename things in ARDUINOJSON_NAMESPACE to match the public names
• Add documentation to most public symbols
• Remove support for naked char (was deprecated since 6.18.0)

BREAKING CHANGES

This release hides JsonVariant's functions that were only intended for internal use. If you were using them in your programs, you must replace with operator[] and to<JsonVariant>(), like so:

// before
JsonVariant a = variant.getElement(idx);
JsonVariant b = variant.getOrAddElement(idx);
JsonVariant c = variant.getMember(key);
JsonVariant d = variant.getOrAddMember(key);

// after
JsonVariant a = variant[idx];
JsonVariant b = idx < variant.size() ? variant[idx] : variant[idx].to<JsonVariant>();
JsonVariant c = variant[key];
JsonVariant d = variant.containsKey(key) ? variant[key] : variant[key].to<JsonVariant>();

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