# File lib/safemode/core_jails.rb, line 19
    def core_classes
      klasses = [ Array, Float, Hash, Range, String, Symbol, Time, NilClass, FalseClass, TrueClass ]
      klasses << Date if defined? Date
      klasses << DateTime if defined? DateTime
      if RUBY_VERSION >= '2.4.0'
        klasses << Integer
      else
        klasses << Bignum
        klasses << Fixnum
      end
      klasses
    end