feat!: rework the public API to json/v2-style variadic options

Assisted-by: GLM 5.3 Flash

example_test.go

@@ -70,12 +70,11 @@ func ExampleMarshal() {
 	// port = 9090
 }
 
-func ExampleDecoder() {
+func ExampleNumbersAsLiterals() {
 	var tree map[string]any
-	err := interpres.NewDecoder().
-		DisallowUnknownFields().
-		UseNumber().
-		Decode([]byte("rate = 1_000\n"), &tree)
+	err := interpres.Unmarshal([]byte("rate = 1_000\n"), &tree,
+		interpres.RejectUnknownFields(true),
+		interpres.NumbersAsLiterals(true))
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -83,16 +82,15 @@ func ExampleDecoder() {
 	// Output: 1_000 1_000
 }
 
-func ExampleEncoder() {
+func ExampleInlineTables() {
 	type Config struct {
 		Title  string            `toml:"title"`
 		Extras map[string]string `toml:"extras,inline"`
 	}
-	out, err := interpres.NewEncoder().
-		Layout(interpres.LayoutKindDeclaration).
-		LiteralMultiline(80).
-		InlineTables(40).
-		Marshal(Config{Title: "demo", Extras: map[string]string{"b": "two", "a": "one"}})
+	out, err := interpres.Marshal(Config{Title: "demo", Extras: map[string]string{"b": "two", "a": "one"}},
+		interpres.Layout(interpres.LayoutKindDeclaration),
+		interpres.LiteralMultiline(80),
+		interpres.InlineTables(40))
 	if err != nil {
 		log.Fatal(err)
 	}