Issue #76 - Add two override version of documented to ensure correct type erase

Author: boretti

src/main/java/ch/powerunit/extensions/exceptions/BinaryOperatorWithException.java

@@ -81,6 +81,11 @@ default BinaryOperator<T> ignore() {
 		return (t, u) -> ObjectReturnExceptionHandlerSupport.unchecked(() -> apply(t, u), e -> null);
 	}
 
+	@Override
+	default BinaryOperatorWithException<T, E> documented(Supplier<String> toString) {
+		return (BinaryOperatorWithException<T, E>) BiFunctionWithException.super.documented(toString);
+	}
+
 	/**
 	 * Returns a binary operator that always throw exception.
 	 *

src/main/java/ch/powerunit/extensions/exceptions/UnaryOperatorWithException.java

@@ -77,6 +77,11 @@ default UnaryOperator<T> ignore() {
 		return t -> ObjectReturnExceptionHandlerSupport.unchecked(() -> apply(t), e -> null);
 	}
 
+	@Override
+	default UnaryOperatorWithException<T, E> documented(Supplier<String> toString) {
+		return (UnaryOperatorWithException<T, E>) FunctionWithException.super.documented(toString);
+	}
+
 	/**
 	 * Returns a unary operator that always returns its input argument.
 	 *

src/test/java/ch/powerunit/extensions/exceptions/BinaryOperatorWithExceptionTest.java

@@ -73,5 +73,12 @@ public void testLiftedException() {
 			throw new Exception();
 		}).apply("x", "x")).is(optionalIsNotPresent());
 	}
+	
+	@Test
+	public void testDocumented() {
+		BinaryOperatorWithException<String, Exception> fct1 = (x, y) -> x + y;
+		fct1 = fct1.documented(() -> "test");
+		assertThat(fct1.toString()).is("test");
+	}
 
 }

src/test/java/ch/powerunit/extensions/exceptions/UnaryOperatorWithExceptionTest.java

@@ -92,4 +92,11 @@ public void testLiftedException() {
 			throw new Exception();
 		}).apply("x")).is(optionalIsNotPresent());
 	}
+
+	@Test
+	public void testDocumented() {
+		UnaryOperatorWithException<String, Exception> fct1 = x -> x;
+		fct1 = fct1.documented(() -> "test");
+		assertThat(fct1.toString()).is("test");
+	}
 }