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Ada big numbers is a set of packages providing arbitrary size
numbers. Currently there are three types:
* Big_Natural
* Big_Integer
* Big_Rational

Those are provided by the packages:
* Big_Numbers.Big_Naturals
* Big_Numbers.Big_Integers
* Big_Numbers.Big_Rationals

The only application (so far) is the unit tests (using Ahven).

The packages should only depend on Ada 2005 features.