no need for empty parenthesis when using Long option

README.md

@@ -134,7 +134,6 @@ Package publicid generates and validates NanoID strings designed to be publicly
   - [func Alphabet\(a string\) Option](<#Alphabet>)
   - [func Attempts\(n int\) Option](<#Attempts>)
   - [func Len\(len int\) Option](<#Len>)
-  - [func Long\(\) Option](<#Long>)
 
 
 ## Constants
@@ -160,7 +159,7 @@ const (
 ```
 
 <a name="New"></a>
-## func [New](<https://github.com/agentstation/publicid/blob/master/publicid.go#L67>)
+## func [New](<https://github.com/agentstation/publicid/blob/master/publicid.go#L65>)
 
 ```go
 func New(opts ...Option) (string, error)
@@ -169,7 +168,7 @@ func New(opts ...Option) (string, error)
 New generates a unique nanoID with a length of 8 characters and the given options.
 
 <a name="Validate"></a>
-## func [Validate](<https://github.com/agentstation/publicid/blob/master/publicid.go#L91>)
+## func [Validate](<https://github.com/agentstation/publicid/blob/master/publicid.go#L89>)
 
 ```go
 func Validate(id string, opts ...Option) error
@@ -186,8 +185,14 @@ Option is a function type for configuring ID generation.
 type Option func(*config)
 ```
 
+<a name="Long"></a>Long returns an Option to set the length of the ID to be generated to 12.
+
+```go
+var Long Option = Len(LongIDLength)
+```
+
 <a name="Alphabet"></a>
-### func [Alphabet](<https://github.com/agentstation/publicid/blob/master/publicid.go#L60>)
+### func [Alphabet](<https://github.com/agentstation/publicid/blob/master/publicid.go#L58>)
 
 ```go
 func Alphabet(a string) Option
@@ -213,15 +218,6 @@ func Len(len int) Option
 
 Len returns an Option to set the length of the ID to be generated.
 
-<a name="Long"></a>
-### func [Long](<https://github.com/agentstation/publicid/blob/master/publicid.go#L55>)
-
-```go
-func Long() Option
-```
-
-Long returns an Option to set the length of the ID to be generated to 12.
-
 Generated by [gomarkdoc](<https://github.com/princjef/gomarkdoc>)
 
 

publicid.go

@@ -52,9 +52,7 @@ func Len(len int) Option {
 }
 
 // Long returns an Option to set the length of the ID to be generated to 12.
-func Long() Option {
-	return Len(LongIDLength)
-}
+var Long Option = Len(LongIDLength)
 
 // Alphabet returns an Option to set the alphabet to be used for ID generation.
 func Alphabet(a string) Option {

publicid_benchmark_test.go

@@ -26,7 +26,7 @@ func BenchmarkNewWithAttempts(b *testing.B) {
 
 func BenchmarkLong(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		_, err := publicid.New(publicid.Long())
+		_, err := publicid.New(publicid.Long)
 		if err != nil {
 			b.Fatal(err)
 		}
@@ -35,7 +35,7 @@ func BenchmarkLong(b *testing.B) {
 
 func BenchmarkLongWithAttempts(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		_, err := publicid.New(publicid.Long(), publicid.Attempts(5))
+		_, err := publicid.New(publicid.Long, publicid.Attempts(5))
 		if err != nil {
 			b.Fatal(err)
 		}
@@ -57,13 +57,13 @@ func BenchmarkValidate(b *testing.B) {
 }
 
 func BenchmarkValidateLong(b *testing.B) {
-	id, err := publicid.New(publicid.Long())
+	id, err := publicid.New(publicid.Long)
 	if err != nil {
 		b.Fatal(err)
 	}
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		err := publicid.Validate(id, publicid.Long())
+		err := publicid.Validate(id, publicid.Long)
 		if err != nil {
 			b.Fatal(err)
 		}

publicid_test.go

@@ -36,27 +36,27 @@ func TestNewWithAttempts(t *testing.T) {
 }
 
 func TestLong(t *testing.T) {
-	id, err := New(Long())
+	id, err := New(Long)
 	if err != nil {
 		t.Errorf("New(Long()) returned an error: %v", err)
 	}
 	if len(id) != LongIDLength {
 		t.Errorf("New(Long()) returned id with length %d, want %d", len(id), LongIDLength)
 	}
-	if err := Validate(id, Long()); err != nil {
+	if err := Validate(id, Long); err != nil {
 		t.Errorf("New(Long()) returned invalid id: %v", err)
 	}
 }
 
 func TestNewLongWithAttempts(t *testing.T) {
-	id, err := New(Long(), Attempts(5))
+	id, err := New(Long, Attempts(5))
 	if err != nil {
 		t.Errorf("New(Long(), Attempts(5)) returned an error: %v", err)
 	}
 	if len(id) != LongIDLength {
 		t.Errorf("New(Long(), Attempts(5)) returned id with length %d, want %d", len(id), LongIDLength)
 	}
-	if err := Validate(id, Long()); err != nil {
+	if err := Validate(id, Long); err != nil {
 		t.Errorf("New(Long(), Attempts(5)) returned invalid id: %v", err)
 	}
 }
@@ -83,13 +83,13 @@ func TestValidate(t *testing.T) {
 		wantError bool
 	}{
 		{"Valid Default ID", "abCD1234", nil, false},
-		{"Valid Long ID", "abCD1234EFGH", []Option{Long()}, false},
+		{"Valid Long ID", "abCD1234EFGH", []Option{Long}, false},
 		{"Valid Custom Length ID", "abCD123456", []Option{Len(10)}, false},
 		{"Empty ID", "", nil, true},
 		{"Short ID", "abc123", nil, true},
 		{"Long ID", "abcDEF123456", nil, true},
 		{"Invalid char", "abCD12_4", nil, true},
-		{"Invalid Long ID", "abCD1234EF", []Option{Long()}, true},
+		{"Invalid Long ID", "abCD1234EF", []Option{Long}, true},
 	}
 
 	for _, tc := range testCases {