Arrays do not use strict comparison

[X455u]

The arrays' equal function does not use strict (===) comparison when comparing structures. This could cause problems for instance when comparing values 0 and "".

Currently, arrays that are initialized with a DOM/jQuery element will always get data-value-type="string", which means that JSAV grading will work although the values in the array of the model solution would have data-value-type="number". (check: examples/simple-exercise.html)

Trees on the other hand use strict comparison, when comparing nodes.