HarmonyOS关于代码中自动将string转成number的问题

private hasRequestedConversationList(): boolean { 
  Logg.i(this.TAG, "hasRequestedConversationList 1 ：" + (IMManager.getInstance().getIMParam() === undefined)); 
  let currentUcid:string = IMManager.getInstance().getIMParam()?.ucid??''; 
  Logg.i(this.TAG, "hasRequestedConversationList ucid ：" + currentUcid); 
  // if (StringUtils.isNullOrBlank(currentUcid)) { 
  if (StringUtils.isNullOrBlank(currentUcid)) { 
    Logg.i(this.TAG, "hasRequestedConversationList 2 " ); 
    return false; 
  } 
  StringUtils.isNullOrBlank代码： 
  /** 
   * 字符串是否为空或'' 
   */ 
  public static isNullOrBlank(str: string | null | undefined): boolean { 
    if (str === null || str === undefined || str.trim().length === 0) { 
      return true 
    } 
    return false 
  }

export class IMParam{ 
  ucid?:string; 
  /** 
   * 是否是Debug环境 
   */ 
  isDebugEnv?:boolean; 
}