let buf = Buffer.from([0xa4,0xfb,0x02,0x12,0x9a,0x90,0x7c,0x4a]);
这个buffer是一个小端的大整数，5367323847320337316用buf.readUIntLE(0,8)只能得到5367323847320337000
如何得到正确的结果？求大概描述一下思路。
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bignum计算的问题，求个思路
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