[PATCH] Added elementType to Array object in order to handle empty arrays correctly.

[Konstantinos Chasialis]

Hello!

Previously, we inferred the array type by extracting the first element of
the array and checking its type. This is not very robust and does not
handle empty arrays. I have updated the schema to contain an string-enum
elementType that declares that type of the array's elements.

Please note that NULL is missing, do you believe it should be added?

0010-Added-elementType-to-Array-object-in-order-to-handle.patch
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