/usr/lib/ruby/vendor_ruby/active_support/core_ext/string/behavior.rb is in ruby-activesupport-3.2 3.2.16-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | class String
# Enable more predictable duck-typing on String-like classes. See <tt>Object#acts_like?</tt>.
def acts_like_string?
true
end
end
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