Import clean up

Author: cowtowncoder

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

@@ -21,9 +21,9 @@ public final class JsonStringEncoder
     /**********************************************************************
      */
 
-    private final static char[] HC = CharTypes.copyHexChars();
+    private final static char[] HC = CharTypes.copyHexChars(true);
 
-    private final static byte[] HB = CharTypes.copyHexBytes();
+    private final static byte[] HB = CharTypes.copyHexBytes(true);
 
     private final static int SURR1_FIRST = 0xD800;
     private final static int SURR1_LAST = 0xDBFF;

src/test/java/com/fasterxml/jackson/core/fuzz/Fuzz51806JsonPointerParse818Test.java

@@ -8,7 +8,7 @@
 public class Fuzz51806JsonPointerParse818Test extends BaseTest
 {
     // Before fix, looks like this is enough to cause StackOverflowError
-    private final static int TOO_DEEP_PATH = 6000;
+    private final static int TOO_DEEP_PATH = 10_000;
 
     // Verify that a very deep/long (by number of segments) JsonPointer
     // may still be parsed ok, for "simple" case (no quoted chars)

src/test/java/com/fasterxml/jackson/core/io/doubleparser/FastDoubleParserTest.java

@@ -12,7 +12,6 @@
 import org.junit.jupiter.api.DynamicNode;
 import org.junit.jupiter.api.TestFactory;
 
-import java.nio.charset.StandardCharsets;
 import java.util.function.ToDoubleFunction;
 import java.util.function.ToLongFunction;
 import java.util.stream.Stream;