如何在Lua中精确限制数字大小，同时避免精度损失？

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原始信息：起始信息：I need to multiply two 64 bit numbers, but Lua is losing precision with big numbers. (for example 99999999999999999 is shown as 100000000000000000) After multiplying, I need a 64 bit solution, so I need a way to limit the so...

改写内容：我需要计算两个64位数的乘积，但Lua在处理大数时精度丢失。