Changelog

0.2.4

Add support for load and dump;
Check for overflow in __len__;

0.2.3

Support for fluent interface;

0.2.2

PlainCounter implementation;

0.2.1

Counter can take some iterable to constructor;

0.2.0

Add serialization support for Counter;
Add union support for Counter;

0.1.0 (initial release)

Prototype.