read globals w/o eval

global_variable_get.rb

require 'fiddle'                                                                
                                                                                
module Kernel                                                                   
  fname = 'rb_gv_get'                                                           
                                                                                
  if Fiddle::Handle::DEFAULT.sym_defined?(fname)                                
    sym = Fiddle::Handle::DEFAULT.sym(fname)                                    
    fun = Fiddle::Function.new(sym, [:const_string], :voidp, name: fname)       
    define_method(fname, &fun)                                                  
  end                                                                           
                                                                                
  def global_variable_get(name) = rb_gv_get(name).to_value                      
end                                                                             
                                                                                
$kitty_katz = "🐱🐈😹😻"                                                        
                                                                                
puts global_variable_get('kitty_katz').grapheme_clusters.sample #=> 😻