/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_property_info.rb is in ruby-gir-ffi 0.9.0-2.
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 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | module GObjectIntrospection
  # Wraps a GIPropertyInfo struct.
  # Represents a property of an IObjectInfo or an IInterfaceInfo.
  class IPropertyInfo < IBaseInfo
    def property_type
      ITypeInfo.wrap(Lib.g_property_info_get_type @gobj)
    end
    def flags
      Lib.g_property_info_get_flags @gobj
    end
    def readable?
      flags & 1 != 0
    end
    def writeable?
      flags & 2 != 0
    end
    def construct?
      flags & 4 != 0
    end
    def construct_only?
      flags & 8 != 0
    end
  end
end
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