Required Properties - Properties in Oxygene can now be marked with the 'required' directive. The new directive addition mandates explicit initialization of the properties every time an instance of the containing class or any of its descendants is created. This enhancement directly promotes the principle of fail-fast, which allows developers to detect potential issues at the earliest stages of instantiation.
Inline Variable Declarations in is Type Checks - This addition promotes not only readability but also enhances code efficiency. Essentially, the source value is type-cast to the target type, if it matches, and made available as a new named variable.