Hello, 
I'm new to v8-dev, sorry if this was already asked before.

my problem is, i re-implemented a c++ numerical lib using typescript, and 
some test cases failed due to float number not having enough accuracy
(i debugged js/c++ code side by side with chrome devtool&msvc)
right now, my only option is to user third party lib like `decimal.js`

i wonder is there any way to increase float number accuracy like c++ double 
type? 

example, is there anyway to store more than 15 decimal places in number
```
> let pi = 3.141592653589793238462643383280;
< undefined
> pi
< 3.141592653589793
```

not sure if this is possible in v8, if yes, where should i start?

thanks!

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