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Compare boxed values by value in Java (#851)

We represent the integers, the floats and the booleans as ``Long``'s,
``Double``'s and ``Boolean``'s in the arguments, the properties and
the collections, so ``==`` and ``!=`` compared the references of two
such values. This worked only by chance for the ``Long``'s between -128
and 127, which Java caches, and practically never for the ``Double``'s.

We now unbox the left operand, *e.g.*,
``(long) child.getAOnly() == childCopy.getAOnly()``, unless an operand
is a literal, an arithmetic result or a length, which are primitives
already.

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