FunctionExt (jtrinkets 1.0.0-SNAPSHOT API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@PrimaryRequirement(updates=java.util.function.Function.class)
@FunctionalInterface
public interface FunctionExt<T,R,E extends java.lang.Throwable>
```
Changes for Function

Why:
1. If a Function lambda throws a checked exceptions, then the developer has to messily wrap it in a RuntimeException.
2. If Function.apply throws a RuntimeException, then the compiler will not warn the developer.
3. This class provides type-safe exceptions, which is not currently possible with java.util.function classes.

To eliminate the need for this class:
1. Java should support default values for generic parameters.
2. Modify java.util.function.Function<T, R> to Function<T, R, E extends Throwable = Throwable>

Risk:
1. Maintains source compatibility because the E parameter can be omitted.
2. Maintains binary compatibility because generic types are erased.
3. Impact on code using Reflection APIs should be minimal.

Method Summary

Modifier and Type	Method	Description
`default <V> FunctionExt<T,V,E>`	`andThen(FunctionExt<? super R,? extends V,E> after)`
`R`	`apply(T t)`
`default <V> FunctionExt<V,R,E>`	`compose(FunctionExt<? super V,? extends T,E> before)`
`static <T> FunctionExt<T,T,java.lang.Throwable>`	`identity()`

Method Detail

apply

@Update
R apply(T t)
 throws E extends java.lang.Throwable

Throws:: E extends java.lang.Throwable

compose

@Update
default <V> FunctionExt<V,R,E> compose(FunctionExt<? super V,? extends T,E> before)

andThen

@Update
default <V> FunctionExt<T,V,E> andThen(FunctionExt<? super R,? extends V,E> after)

identity

@Update
static <T> FunctionExt<T,T,java.lang.Throwable> identity()