Bug #20874: Difference in documentation for `irb -U` between `man irb` and `irb --help`

• Status: Open
• Assignee: -
• Target version: -
• Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN

[kyanagi (Kouhei Yanagita)]

There is a difference in documentation for irb -U between man irb and irb --help.

• man irb: Same as `ruby -U' . Sets the default value for internal encodings (Encoding.default_internal) to UTF-8.
• irb --help: Set external and internal encodings to UTF-8.

Which is correct?

The implementation matches that of --help. However, it also seems to have been implemented with the intention of behaving the same as ruby -U.