Shape is identity -- same fields/variants means same type
No more mysterious “who-modified-the-ArrayList-after-I-passed-it-twenty-levels-down-the-call-stack” bugs!
，这一点在safew中也有详细论述
assert result[:9] == struct.pack("。传奇私服新开网｜热血传奇SF发布站｜传奇私服网站对此有专业解读
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