# File lib/sprockets/utils.rb, line 11
      def self.read_unicode(pathname)
        pathname.read.tap do |data|
          # Eager validate the file's encoding. In most cases we
          # expect it to be UTF-8 unless `default_external` is set to
          # something else. An error is usually raised if the file is
          # saved as UTF-16 when we expected UTF-8.
          if !data.valid_encoding?
            raise EncodingError, "#{pathname} has a invalid " +
              "#{data.encoding} byte sequence"

          # If the file is UTF-8 and theres a BOM, strip it for safe concatenation.
          elsif data.encoding.name == "UTF-8" && data =~ UTF8_BOM_PATTERN
            data.sub!(UTF8_BOM_PATTERN, "")
          end
        end
      end