Bug #13959: IO.write(filename, Marshal.dump(obj), :encoding => 'binary') != File.open(filename, 'wb') { |fil| Marshal.dump(obj, fil) }

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.4.2p198 (2017-09-14 revision 59899) [x64-mingw32]
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN

[fitmap (Justin Peal)]

For some complex objects,

IO.write(filename, Marshal.dump(obj), :encoding => 'binary') and File.open(filename, 'wb') { |fil| Marshal.dump(obj, fil) }

can create different file content, and these files can't load each other by

Marshal.load(IO.read(filename, :encoding => 'binary')) and File.open(filename, 'rb') { |fil| return Marshal.load(fil) }

Detail is in the attached.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Rejected

:encoding => 'binary' does not set binmode, but just makes the result encoding ASCII-8bit.
Use IO.binread and IO.binwrite to read/write binary data.