Lua中所有的数字都是双精度的(不过我们可以非常简便地编写一些代码来实现其他数字类型)。
All Numbers in Lua are doubles (but you can easily build code to realize other numeric types).
double类型也可以表示为DOUBLE PRECISION，虽然为什么在需要双精度数字时要输入额外的单词，原因不明。
The double type can also be referred to as double precision, although it isn't clear why you would want to type the extra word every time you need a double-precision number.
Regan 推测这个特殊数字的麻烦之处在于它是“最大的次法线双精度浮点数”。
Regan speculated that this particular number is troublesome because it is the "largest subnormal double-precision floating-point number."
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