all_symbols() public

Returns an array of all the symbols currently in Ruby’s symbol table. 

   Symbol.all_symbols.size    #=> 903
   Symbol.all_symbols[1,20]   #=> [:floor, :ARGV, :Binding, :symlink,
                                   :chown, :EOFError, :$;, :String,
                                   :LOCK_SH, :"setuid?", :$<,
                                   :default_proc, :compact, :extend,
                                   :Tms, :getwd, :$=, :ThreadGroup,
                                   :wait2, :$>]
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