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* Classes can define finalizers explicitly, by defining a public `finalize` method. ([#92](https://github.com/wch/R6/issues/92), [#93](https://github.com/wch/R6/pull/93))
* Added function `is.R6()` and `is.R6Class()`. ([#95](https://github.com/wch/R6/pull/95))
* Fixed [#96](https://github.com/wch/R6/issues/96): R6 now avoids using `$` and `[[` after the class has been assigned to the object. This allows the user to provide their own methods for `$` and `[[` without causing problems to R6's operation.
R6 2.1.3
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* The `plot` S3 method for R6 objects will call `$plot` on the object if present. (#77)
* Fixed priting of members that are R6 objects. (#88)
* Fixed deep cloning for non-portable classes. (#85)
* Added `as.list.R6` method. (#91)
R6 2.1.2
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* Implemented `format.R6()` and `format.R6ClassGenerator`, the former calls a public `format` method if defined. This might change the functionality of existing classes that define a public `format` method intended for other purposes (#73. Thanks to Kirill Müller)
* Functions are shown with their interface in `print` and `format`, limited to one line (#76. Thanks to Kirill Müller)
* R6 objects and generators print out which class they inherit from. (#67)
R6 2.1.1
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* Fixed a bug with printing R6 objects when a `[[` method is defined for the class. (#70)
* Fixed cloning of objects that call a `super` method which accesses `private`. (#72)
R6 2.1.0
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* Added support for making clones of R6 objects with a `clone()` method on R6 objects. The `deep=TRUE` option allows for making clones that have copies of fields with reference semantics (like other R6 objects). (#27)
* Allow adding public or private members when there were no public or private members to begin with. (#51)
* Previously, when an R6 object was printed, it accessed (and called) active bindings. Now it simply reports that a field is an active binding. (#37, #38. Thanks to Oscar de Lama)
* Printing private members now works correctly for portable R6 objects. (#26)
* The 'lock' argument has been renamed to 'lock_objects'. Also, there is a new argument, 'lock_class', which can prevent changes to the class. (#52)
* Fixed printing of NULL fields.
R6 2.0.1
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* A superclass is validated on object instantation, not on class creation.
* Added `debug` and `undebug` methods to generator object.
R6 2.0
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* [BREAKING CHANGE] Added `portable` option, which allows inheritance across different package namespaces, and made it the default.
* Added `set()` method on class generator object, so new fields and methods can be added after the generator has been created.
* All of the functions involved in instantiating objects are encapsulated in an environment separate from the R6 namespace. This means that if a generator is created with one version of R6, saved, then restored in a new R session that has a different version of R6, there shouldn't be any problems with compatibility.
* Methods are locked so that they can't be changed. (Fixes #19)
* Inheritance of superclasses is dynamic; instead of reading in the superclass when a class is created, this happens each time an object is instantiated. (Fixes #12)
* Added trailing newline when printing R6 objects. (Thanks to Gabor Csardi)
* The `print` method of R6 objects can be redefined. (Thanks to Gabor Csardi)
R6 1.0.1
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* First release on CRAN.
* Removed pryr from suggested packages.
R6 1.0
========
* First release
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