Freezable (AO Lang 5.2.0 API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface Freezable<F>
```
An object that is freezable begins life as mutable, but once frozen becomes unmodifiable and thread-safe. The object may internally block additional changes and return itself, or may return a different object instance representing its immutable form.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  F freeze()

- Method Detail
  - freeze
```
F freeze()
```