Issue #22079 has been updated by nobu (Nobuyoshi Nakada). Backport changed from 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN to 3.3: REQUIRED, 3.4: REQUIRED, 4.0: REQUIRED [GH-17097](https://github.com/ruby/ruby/pull/17097) ---------------------------------------- Bug #22079: Float#ceil gives incorrect result https://bugs.ruby-lang.org/issues/22079#change-117400 * Author: cryptogopher (crypto gopher) * Status: Open * ruby -v: ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux] * Backport: 3.3: REQUIRED, 3.4: REQUIRED, 4.0: REQUIRED ---------------------------------------- Let's take following number as an example: ``` ruby

Float::MIN => 2.2250738585072014e-308

This gives proper result:
```ruby
> Float::MIN.ceil(308)
=> 2.9999999999999997e-308

But this does not: ```ruby

Float::MIN.floor(309) => NaN

even though the result is perfectly valid `Float` number:
```ruby
> "2.3e-308".to_f
=> 2.3e-308

-- https://bugs.ruby-lang.org/