fixnum library Null safety

Signed 32- and 64-bit integer support.

The integer implementations in this library are designed to work identically whether executed on the Dart VM or compiled to JavaScript.

Classes

Int32
An immutable 32-bit signed integer, in the range -2^31, 2^31 - 1. Arithmetic operations may overflow in order to maintain this range.
Int64
An immutable 64-bit signed integer, in the range -2^63, 2^63 - 1. Arithmetic operations may overflow in order to maintain this range.
IntX
A fixed-precision integer.