如何避免Spring缓存中的大小写敏感的键？

@Component
public class CustomKeyGenerator implements KeyGenerator {
    @Override
    public Object generate(Object target, Method method, Object... params) {
        // 生成缓存键的逻辑
        // 将键转换为小写或大写
        return key.toLowerCase(); // 或 key.toUpperCase();
    }
}

@Cacheable(value = "myCache", keyGenerator = "customKeyGenerator")
public Object myMethod() {
    // 方法逻辑
}

@Cacheable(value = "myCache", key = "#root.targetClass.name + ':' + #root.methodName + ':' + #root.args[0].toLowerCase()")
public Object myMethod(String key) {
    // 方法逻辑
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Cacheable(value = "myCache", keyGenerator = "customKeyGenerator")
public @interface MyCacheable {
    String value() default "";
}

@MyCacheable
public Object myMethod() {
    // 方法逻辑
}