jsonpath support ~

core/src/main/java/com/alibaba/fastjson2/JSONReader.java

@@ -487,6 +487,7 @@ final char char1(int c) {
             case ')':
             case '_':
             case ',':
+            case '~':
                 return (char) c;
             default:
                 throw new JSONException(info("unclosed.str '\\" + (char) c));

core/src/test/java/com/alibaba/fastjson2/issues_3200/Issue3219.java

@@ -0,0 +1,27 @@
+package com.alibaba.fastjson2.issues_3200;
+
+import com.alibaba.fastjson2.JSON;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static com.alibaba.fastjson2.JSONWriter.Feature.ReferenceDetection;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
+public class Issue3219 {
+    @Test
+    public void test() {
+        Map<String, Object> innerMap = new HashMap<>();
+        innerMap.put("xxx", "xxxx");
+        innerMap.put("ttt", "tttt");
+        Map<String, Object> map = new LinkedHashMap<>();
+        map.put("key1~", innerMap);
+        map.put("key2", innerMap);
+
+        String josnStr1 = JSON.toJSONString(map, ReferenceDetection);
+        Map map2 = JSON.parseObject(josnStr1, Map.class);
+        assertSame(map2.get("key2"), map2.get("key1~"));
+    }
+}