Fix: Incorrect type declaration about 'Number'

[tari404]

In #2260 , Number was declared as typeof F64 (equivalent to typeof _Float), which causes all numbers to be considered as a Class with some methods that don't belong to it, just like:

I updated the declaration of Number according to the document. I think this is a small change, so I submit PR directly.

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[dcodeIO]

Wondering if it is sufficient to change

declare type Number = typeof F64;

to

declare type Number = F64;

to make it the desired alias, including all properties?

[tari404]

Wondering if it is sufficient to change

declare type Number = typeof F64;

to

declare type Number = F64;

to make it the desired alias, including all properties?

I think it's better and add a new commit. *but it should be:

declare type Number = _Float;