[ruby-core:119764] [Ruby master Bug#20873] `printf("%f")` returns wrong result for `Rational` with `FIXNUM_MIN`

Issue #20873 has been reported by nobu (Nobuyoshi Nakada).

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Bug #20873: `printf("%f")` returns wrong result for `Rational` with `FIXNUM_MIN`
https://bugs.ruby-lang.org/issues/20873

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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Since the beginning, ruby 2.3.

```ruby
require 'rbconfig/sizeof'
fmin, fmax = RbConfig::LIMITS.values_at("FIXNUM_MIN", "FIXNUM_MAX")
sprintf("%f", Rational(fmin, fmax)) #=> --1.000000
```




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