Enforce exact match for bounds of nested type variable

Closes gh-34300

spring-core/src/main/java/org/springframework/core/ResolvableType.java

@@ -329,9 +329,6 @@ public class ResolvableType implements Serializable {
 					other.getComponentType(), true, matchedBefore, upUntilUnresolvable));
 		}
 
-		// We're checking nested generic variables now...
-		boolean exactMatch = (strict && matchedBefore != null);
-
 		// Deal with wildcard bounds
 		WildcardBounds ourBounds = WildcardBounds.get(this);
 		WildcardBounds otherBounds = WildcardBounds.get(other);
@@ -345,8 +342,9 @@ public class ResolvableType implements Serializable {
 			else if (upUntilUnresolvable) {
 				return otherBounds.isAssignableFrom(this, matchedBefore);
 			}
-			else if (!exactMatch) {
-				return otherBounds.isAssignableTo(this, matchedBefore);
+			else if (!strict) {
+				return (matchedBefore != null ? otherBounds.equalsType(this) :
+						otherBounds.isAssignableTo(this, matchedBefore));
 			}
 			else {
 				return false;
@@ -359,6 +357,7 @@ public class ResolvableType implements Serializable {
 		}
 
 		// Main assignability check about to follow
+		boolean exactMatch = (strict && matchedBefore != null);
 		boolean checkGenerics = true;
 		Class<?> ourResolved = null;
 		if (this.type instanceof TypeVariable<?> variable) {
@@ -1782,6 +1781,21 @@ public class ResolvableType implements Serializable {
 			}
 		}
 
+		/**
+		 * Return {@code true} if these bounds are equal to the specified type.
+		 * @param type the type to test against
+		 * @return {@code true} if these bounds are equal to the type
+		 * @since 6.2.3
+		 */
+		public boolean equalsType(ResolvableType type) {
+			for (ResolvableType bound : this.bounds) {
+				if (!type.equalsType(bound)) {
+					return false;
+				}
+			}
+			return true;
+		}
+
 		/**
 		 * Return the underlying bounds.
 		 */