is_array() is True, but raise 'cannot use operator[] for object iterators'

[estelll]

• Describe what you want to achieve.
  There are two array A, B in the same size. In python I can use zip(A, B) to get elements from them at the same time. But I am not sure how to get it using this cpp.

• Describe what you tried.
  I first get the array size by 'A.size()', then I iterate the index from 0 to the size. And using A[idx] and B[idx] to get elements separately.
  However, it raise

 terminate called after throwing an instance of 'nlohmann::detail::invalid_iterator'
  what():  [json.exception.invalid_iterator.208] cannot use operator[] for object iterators

And I am sure A and B is an array instead of object since I A.is_array() is True and B.is_array() is True too

• Describe which system (OS, compiler) you are using.
  LInux

• Describe which version of the library you are using (release version, develop branch).
  develop branch, 3.7.0

[nlohmann]

Can you provide a code example?

[stale]

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