resolves #12 with an API breaking change: Now integer keys are used as object attributes, not as array indexes by default. But can use {useIntKeysAsArrayIndex: true} option for backwards compatibility
Update README file with instructions about the new option useIntKeysAsArrayIndex
Bump version to 2.0.0. This is a major release because of the breaking changes, now the serialization is a little different and needs a setting to behave like before.