Minor warnings removal; add constraints accessor in TokenBuffer

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/databind/util/TokenBuffer.java

@@ -1541,6 +1541,13 @@ public JacksonFeatureSet<StreamReadCapability> getReadCapabilities() {
             return DEFAULT_READ_CAPABILITIES;
         }
 
+        // 03-Dec-2022, tatu: Not 100% sure what to do here; could probably instead
+        //    pass from somewhere?
+        @Override
+        public StreamReadConstraints streamReadConstraints() {
+            return StreamReadConstraints.defaults();
+        }
+
         /*
         /**********************************************************
         /* Extended API beyond JsonParser

src/main/java/com/fasterxml/jackson/databind/util/internal/PrivateMaxEntriesMap.java

@@ -29,6 +29,7 @@
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Queue;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
@@ -201,7 +202,7 @@ private static int readBufferIndex(int bufferIndex, int entryIndex) {
      * Creates an instance based on the builder's configuration.
      */
     @SuppressWarnings({"unchecked", "cast"})
-    private PrivateMaxEntriesMap(Builder<K, V> builder) {
+    PrivateMaxEntriesMap(Builder<K, V> builder) {
         // The data store and its maximum capacity
         concurrencyLevel = builder.concurrencyLevel;
         capacity = new AtomicLong(Math.min(builder.capacity, MAXIMUM_CAPACITY));
@@ -1161,7 +1162,6 @@ public static final class Builder<K, V> {
         int initialCapacity;
         long capacity;
 
-        @SuppressWarnings("unchecked")
         public Builder() {
             capacity = -1;
             initialCapacity = DEFAULT_INITIAL_CAPACITY;