Partial impl of #712 for 2.11

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -14,7 +14,9 @@ JSON library.
 === Releases ===
 ------------------------------------------------------------------------
 
-2.12.0 (not yet released)
+(not yet released)
+
+#712: (partial) Optimize array allocation by JsonStringEncoder
 
 2.11.4 (12-Dec-2020)
 

src/main/java/com/fasterxml/jackson/core/io/JsonStringEncoder.java

@@ -30,8 +30,9 @@ public final class JsonStringEncoder
     private final static int SURR2_FIRST = 0xDC00;
     private final static int SURR2_LAST = 0xDFFF;
 
-    private final static int INITIAL_CHAR_BUFFER_SIZE = 120;
-    private final static int INITIAL_BYTE_BUFFER_SIZE = 200;
+    // 18-Aug-2021, tatu: [core#712] use bit lower defaults for 2.11/2.12
+    private final static int INITIAL_CHAR_BUFFER_SIZE = 30;
+    private final static int INITIAL_BYTE_BUFFER_SIZE = 60;
 
     /*
     /**********************************************************************