## 0.3.0

### Deprecated APIs

* The `ArrayContent` type in the data flow library has been deprecated and made an alias for the `CollectionContent` type, to better reflect the hierarchy of the Swift standard library. Uses of `ArrayElement` in model files will be interpreted as referring to `CollectionContent`.

### Major Analysis Improvements

* The predicates `getABaseType`, `getABaseTypeDecl`, `getADerivedType` and `getADerivedTypeDecl` on `Type` and `TypeDecl` now behave more usefully and consistently. They now explore through type aliases used in base class declarations, and include protocols added in extensions.

To examine base class declarations at a low level without these enhancements, use `TypeDecl.getInheritedType`.

`Type.getABaseType` (only) previously resolved a type alias it was called directly on. This behaviour no longer exists. To find any base type of a type that could be an alias, the construct `Type.getUnderlyingType().getABaseType*()` is recommended.

### Minor Analysis Improvements

* Modelled varargs function in `NSString` more accurately.
* Modelled `CustomStringConvertible.description` and `CustomDebugStringConvertible.debugDescription`, replacing ad-hoc models of these properties on derived classes.
* The regular expressions library now accepts a wider range of mode flags in a regular expression mode flag group (such as `(?u)`). The `(?w`) flag has been renamed from "UNICODE" to "UNICODEBOUNDARY", and the `(?u)` flag is called "UNICODE" in the libraries.
* Renamed `TypeDecl.getBaseType/1` to `getInheritedType`.
* Flow through writes via keypaths is now supported by the data flow library.
* Added flow through variadic arguments, and the `getVaList` function.
* Added flow steps through `Dictionary` keys and values.
* Added taint models for `Numeric` conversions.

### Bug Fixes

* The regular expressions library no longer incorrectly matches mode flag characters against the input.