LFQA-E: Carefully Benchmarking Long-form QA Evaluation - Fan, Yuchen; Ling, Chen; Zhong, Xin; Zhang, Shuo; Zhou, Heng; Zhang, Yuchen; Liang, Mingyu; Xie, Chengxing; Hua, Ermo; He, Zhizhou; Huang, Cheng; Chen, Gang; et al. (International Conference on Learning Representations, 2026)