add Has helper and simplify the Is helper

goe.go

@@ -2,7 +2,6 @@
 package goe
 
 import (
-	"bytes"
 	"encoding/base64"
 	"fmt"
 	"os"
@@ -100,20 +99,15 @@ type EnvKeyType interface {
 }
 
 // Is checks if the env var with the name is equal to the val.
-// If the env var is not found, it will return false.
-func Is[T EnvType](name string, val T) bool {
-	if _, has := os.LookupEnv(name); !has {
-		return false
-	}
-
-	a := any(Require[T](name))
-	b := any(val)
+func Is(name string, val string) bool {
+	return Get(name, "") == val
+}
 
-	if _, ok := a.([]byte); ok {
-		return bytes.Equal(a.([]byte), b.([]byte))
-	}
+// Has checks if the env var with the name exists.
+func Has(name string) bool {
+	_, has := os.LookupEnv(name)
 
-	return a == b
+	return has
 }
 
 // Get env var with the name. It will return the defaultVal if it's not found.

goe_test.go

@@ -31,10 +31,6 @@ func TestGet(t *testing.T) {
 	t.Setenv("DURATION", "1m")
 	t.Setenv("TIME", "2023-12-21T15:41:51+08:00")
 
-	g.True(goe.Is("ENV", "dev"))
-	g.False(goe.Is("ENV", "stg"))
-	g.False(goe.Is("NOT_EXISTS", "dev"))
-
 	type MyInt int
 
 	g.Eq(goe.Get("NUM", MyInt(0)), 2)
@@ -69,6 +65,26 @@ func TestGet(t *testing.T) {
 	}).(error).Error(), `failed to parse int: strconv.ParseInt: parsing "xxx": invalid syntax`)
 }
 
+func TestIs(t *testing.T) {
+	g := got.T(t)
+
+	t.Setenv("ENV", "dev")
+
+	g.True(goe.Is("ENV", "dev"))
+	g.False(goe.Is("ENV", "stg"))
+	g.False(goe.Is("NOT_EXISTS", "dev"))
+	g.True(goe.Is("NOT_EXISTS", ""))
+}
+
+func TestHas(t *testing.T) {
+	g := got.T(t)
+
+	t.Setenv("ENV", "dev")
+
+	g.True(goe.Has("ENV"))
+	g.False(goe.Has("NOT_EXISTS"))
+}
+
 func TestLoad(t *testing.T) {
 	g := got.T(t)