char type upgrade doc

Author: DQinYuan

README-EN-source.adoc

@@ -925,6 +925,21 @@ include::./src/test/java/com/alibaba/qlexpress4/Express4RunnerTest.java[tag=poll
 
 For details, refer to the link:#semicolons[Semicolons] chapter.
 
+=== Obtaining char Type
+
+In QLExpress 3, single characters wrapped in single quotes were parsed as char type, not String.
+
+This caused much confusion for users, for example, the result of `"a"=='a'` would be `false`.
+
+So later in QLExpress 3, the `ExpressRunner.setIgnoreConstChar` option was added. When set to `true`, all characters wrapped in single quotes and double quotes would be parsed as String type. However, this option was turned off by default and required users to manually enable it.
+
+Considering that script users rarely use the `char` primitive type, we directly removed this option in QLExpress 4. All characters wrapped in single quotes and double quotes are now parsed as String type.
+
+If you still need to use `char` type in scripts, you can obtain it through two methods:
+
+* Type casting: `(char) 'a'`
+* Type declaration: `char a = 'a'`
+
 == Appendix II How to Contribute?
 
 QLExpress is completely open to community changes. Any suggestions and modifications will be welcome, and after discussion, reasonable ones will be accepted into the main branch.

README-source.adoc

@@ -927,6 +927,21 @@ include::./src/test/java/com/alibaba/qlexpress4/Express4RunnerTest.java[tag=poll
 
 具体参考 link:#分号[分号] 章节。
 
+=== 获得 char 类型
+
+在 QLExpress 3 中，单引号包裹的单个字符会被解析为 char 类型，而不是 String。
+
+这个给用户带来了不少困惑，比如 `"a"=='a'` 的判断结果是 `false`。
+
+所以后来 QLExpress 3 中新增了 `ExpressRunner.setIgnoreConstChar` 选项，设置为 `true` 后，所有的单引号和双引号包裹的字符都会被解析为 String 类型。但是这个选项默认是关闭的，需要用户手动开启。
+
+考虑到脚本用户很少会使用到 `char` 这种底层类型，我们在 QLExpress 4 中直接取消了这个选项，所有的单引号和双引号包裹的字符都会被解析为 String 类型。
+
+如果您在脚本还是需要使用 `char` 类型，可以通过两种方法获得：
+
+* 类型强转：`(char) 'a'`
+* 类型声明：`char a = 'a'`
+
 == 附录二 如何贡献？
 
 QLExpress 对社区的更改完全开放，任何建议和修改，都会受到欢迎，讨论后合理最后会被接纳到主干中。

src/main/java/com/alibaba/qlexpress4/runtime/MemberResolver.java

@@ -235,7 +235,7 @@ private static int resolveArgPriority(Class<?> paramType, Class<?> argType) {
         if (argType.isPrimitive() && paramType == Object.class) {
             return MatchPriority.EXTEND.priority;
         }
-
+        
         if (argType == Nothing.class || paramType.isAssignableFrom(argType)) {
             return MatchPriority.EXTEND.priority;
         }

src/test/java/com/alibaba/qlexpress4/test/property/Parent.java

@@ -22,9 +22,9 @@ public class Parent implements Value {
     private static final String staticFinal = "staticFinal";
 
     public String sex = "man";
-
+    
     public int lockStatus;
-
+    
     public Integer lockStatus2;
 
     public Parent() {