public Builder clearName() {
        bitField0_ = (bitField0_ & ~0x00000001);
        name_ = getDefaultInstance().getName();
        onChanged();
        return this;
      }
<code>optional string name = 1;</code>
@return This builder for chaining.
core/src/test/java/com/alibaba/fastjson2/protobuf/PersonOuterClass.java