Issue #20662 has been reported by cabo (Carsten Bormann). ---------------------------------------- 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 * 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/