ActiveSupport::ParameterFilter still relies on mutable strings when using blocks

rubyonrails-core
1

Hi,

When adding blocks as filter you need to use for instance replace , which mutates the receiver, in order to mask what you want. This still works, even if you have frozen_string_literal enabled since both k and v are duplicated before this block is called.

    filter_this = -> (k,v,_parents) do
      k == 'key' ? v.replace('[FILTERED]') : v
    end

Will this still work if “The Mutable String Flip” is finally switched in a new Ruby version?