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src/java.base/share/classes/java/lang/StringBuilder.java

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@@ -119,11 +119,12 @@
      *
      * @param   str   the initial contents of the buffer.
      */
     @HotSpotIntrinsicCandidate
     public StringBuilder(String str) {
-        super(str);
+        super(str.coder(), str.length(), 16);
+        append(str);
     }
 
     /**
      * Constructs a string builder that contains the same characters
      * as the specified {@code CharSequence}. The initial capacity of

@@ -131,11 +132,12 @@
      * {@code CharSequence} argument.
      *
      * @param      seq   the sequence to copy.
      */
     public StringBuilder(CharSequence seq) {
-        super(seq);
+        super(String.LATIN1, seq.length(), 16);
+        append(seq);
     }
 
     /**
      * Compares two {@code StringBuilder} instances lexicographically. This method
      * follows the same rules for lexicographical comparison as defined in the
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