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| Predicate jpl_array_to_length/2 | 
jpl_array_to_length(+Array:jref, 
-Length:integer)Length is the length of that array. This is a utility predicate, defined thus:
jpl_array_to_length(A, N) :-
    (   jpl_ref_to_type(A, array(_))
    ->  jGetArrayLength(A, N)
    ).