The class for long integers, limited only by memory size. The result of an operation is automatically converted into a Fixnum if its value is within range; conversely, if the value is out of Fixnum range, it is extended into a Bignum. For bit operations, Bignum can be considered to be an infinite 2's complement bit string. Negative numbers in particular can operate as a string of 1 bits extending indefinitely to the left. Mixing Bignum with Float can result in digit cancellation errors upon conversion.
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