Some cleanup is needed: 

1. The specialize method on the fn:substring function is not needed anymore
2. In the translator, the code that handles fn:subsequence and fn:substring is 
almost the same, and the 2 cases should be unified (like it is done in 

Also, SubstringIntOptIterator::nextImp() should use xs_integer, instead of 
xs_int, for start and len.
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