when the attr is a list that mixed with Int32Imm and Int64Imm (unreasonable, but it occured),
it will crash whether we use GetValue<std::vector<int>> or GetValue<std::vector<int64_t>>.
so we need to traverse the list and pick the numbers manually.

From: @c_34
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From: @ZhengQihao3f3f3f
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From: @laiyongqiang
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From: @yepei6
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From: @wilfchen
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From: @changzherui
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From: @Somnus2020
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From: @yanglf1121
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From: @wang_shaocong
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From: @islam_amin
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From: @gaoyong10
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From: @limingqi107
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From: @islam_amin
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