Add more runnable examples

Add ExampleLittleEqual.
Add examples which run on amd64.

example_amd64_test.go

@@ -4,13 +4,14 @@
 package endian_test
 
 import (
+	"encoding/binary"
 	"fmt"
 	"runtime"
 
 	"github.com/dolmen-go/endian"
 )
 
-func Example() {
+func ExampleLittle() {
 	fmt.Printf("GOARCH=%s: %s\n", runtime.GOARCH, endian.Native)
 
 	const n = 0xDeadBeef
@@ -21,3 +22,15 @@ func Example() {
 	// GOARCH=amd64: LittleEndian
 	// 0xdeadbeef => [ef be ad de]
 }
+
+func ExampleLittleEqual() {
+	for _, bo := range []binary.ByteOrder{
+		binary.BigEndian,
+		binary.LittleEndian,
+	} {
+		fmt.Println("endian.Native ==", bo, "=>", endian.Native == bo)
+	}
+	// Output:
+	// endian.Native == BigEndian => false
+	// endian.Native == LittleEndian => true
+}

example_arm64_test.go

@@ -0,0 +1,36 @@
+//go:build arm64 && !generate
+// +build arm64,!generate
+
+package endian_test
+
+import (
+	"encoding/binary"
+	"fmt"
+	"runtime"
+
+	"github.com/dolmen-go/endian"
+)
+
+func ExampleLittle() {
+	fmt.Printf("GOARCH=%s: %s\n", runtime.GOARCH, endian.Native)
+
+	const n = 0xDeadBeef
+	var b [4]byte
+	endian.Native.PutUint32(b[:], n)
+	fmt.Printf("0x%x => [% x]\n", n, b)
+	// Output:
+	// GOARCH=arm64: LittleEndian
+	// 0xdeadbeef => [ef be ad de]
+}
+
+func ExampleLittleEqual() {
+	for _, bo := range []binary.ByteOrder{
+		binary.BigEndian,
+		binary.LittleEndian,
+	} {
+		fmt.Println("endian.Native ==", bo, "=>", endian.Native == bo)
+	}
+	// Output:
+	// endian.Native == BigEndian => false
+	// endian.Native == LittleEndian => true
+}