Currently if we try to pass the result of val.mb_chars to concat, it ends with
ActiveSupport::Multibyte::Chars can not be converted to CONCAT arg
.../gems/2.5.0/gems/arel_extensions-1.2.12/lib/arel_extensions/nodes/function.rb:77:in `convert_to_node'
This is a revival of https://github.com/Faveod/arel-extensions/pull/27.
Currently if we try to pass the result of
val.mb_chars
to concat, it ends with