contract xxx { } 里面的内容是有上限的吗？编译器提示这个，如果内容要继续增加只能拆开多个contract来实现？

Warning: Contract code size is 25855 bytes and exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.

同时以上提到开启 优化器，这个会有什么影响吗？