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A common pattern for abstract `Builders` is to declare an instance method named
`self()`, which subtypes override and implement as `return this` (see Effective
Java 3rd Edition, Item 2).
Returning anything other than `this` from an instance method named `self()` with
a return type that matches the enclosing class will be confusing for readers and
callers.
## Casting
If an unchecked cast is required, prefer a single-statement cast, with the
suppression on the method (rather than the statement). For example:
```java
@SuppressWarnings("unchecked")
default U self() {
return (U) this;
}
```
Instead of:
```java
default U self() {
@SuppressWarnings("unchecked")
U self = (U) this;
return self;
}
```
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