Issue #20662 has been updated by nobu (Nobuyoshi Nakada). https://github.com/ruby/ruby/pull/11352 I'm uncertain that it is a nice idea to expose such internals of `Float` though. ---------------------------------------- Bug #20662: pack("g") completely discards any actual NaN value and always packs the same single-precision bytes for a NaN https://bugs.ruby-lang.org/issues/20662#change-109383 * Author: cabo (Carsten Bormann) * Status: Open * ruby -v: ruby 3.3.4 (2024-07-09 revision be1089c8ec) [arm64-darwin23] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- `pack("G")`/`unpack("G")` works great with NaN values. However, - `pack("g")` completely discards any actual NaN value and always packs the same bytes for a NaN ("bug as implemented" in `VALUE_to_float`) Also: - `unpack("g")` always sets the quiet bit to 1 in the `Float` result (location of bug not obvious to me) ---Files-------------------------------- showbug.rb (3.21 KB) showbug-arm.txt (5.48 KB) showbug-intel.txt (5.48 KB) -- https://bugs.ruby-lang.org/