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### Upgrade from version 1.42

New features:

1. Range adaptors
2. Range algorithms

Removed:

1. `iterator_range` no longer has a `is_singular` member function. The singularity restrictions have been removed from the `iterator_range` class since this added restrictions to ranges of iterators whose default constructors were not singular. Previously the `is_singular` member function always returned `false` in release build configurations, hence it is not anticipated that this interface change will produce difficulty in upgrading.