Ruby symbol types

symbols.rb

def type(obj)
  case obj.object_id
  when 0
    :false
  when 8
    :nil
  when 20
    :true
  when -> { _1[0] == 1 }
    :integer
  when -> { _1[1] == 1 }
    :float
  when -> { _1 % 20 == 8 }
    id = obj.object_id / 20
    case id[1..3]
    when 0 then :static_sym
    when 1 then :static_ivar_sym
    when 3 then :static_global_sym
    when 4 then :static_attrset_sym
    when 5 then :static_const_sym
    when 6 then :static_civar_sym
    when 7 then :static_junk_sym
    else
      raise  "WTF"
    end
  else
    :heap
  end
end

p 10.times.map { Object.new.object_id }
p 10.times.map { Object.new.object_id.object_id ^ 1 }

p type Object.new
p type :"dynamic#{"sym"}"
p type :sym
p type :@sym
p type :$sym
p type :sym=
p type :Sym
p type :@@sym
p type :"-sym"
p type 1
p type 1.0
p type true
p type false
p type nil