Why does `include?` behave differently than `===` here?

range_string_include_triple_equals_bug.rb

range = '0'..'255'

('1'..'5').map do |v|
  {
    v: v,
    teq: range === v,
    include?: range.include?(v)
  }
end
#  => [
#   { v: "1", teq: true, include?: true },
#   { v: "2", teq: true, include?: true },
#   { v: "3", teq: false, include?: true },
#   { v: "4", teq: false, include?: true },
#   { v: "5", teq: false, include?: true }
# ]

3.1.0 :074 > range = 0..255
 => 0..255
3.1.0 :075 > (1..5).map { |v| { "===": range === v, include?: range.include?(v) } }
 =>
[{:====>true, :include?=>true},
 {:====>true, :include?=>true},
 {:====>true, :include?=>true},
 {:====>true, :include?=>true},
 {:====>true, :include?=>true}]

Wat?