mruby/mruby — pull request #1724 by h2so5 (2014-02-22 07:57:43+00:00)
Title: preserve significands in float-string conversion

#### before
```
mirb - Embeddable Interactive Ruby Shell

> 10.0 ** -8
=> 0.00000001
> 10.0 ** -8.5
=> 0.00000000316227 # lose significant digits
```

#### after
```
mirb - Embeddable Interactive Ruby Shell

> 10.0 ** -8
=> 0.00000001
> 10.0 ** -8.5
=> 3.16227766016837e-09
```