Ruby operator coercion inconsistency

script.rb

Value = Struct.new(:value) do
  def coerce(other)
    puts "called #{self}#coerce(#{other.inspect})"
    [Value.new(other), self]
  end

  def +(other)
    puts "called #{self} + #{other.inspect}"
  end

  def =~(other)
    puts "called #{self} =~ #{other.inspect}"
  end

  def >=(other)
    puts "called #{self} >= #{other.inspect}"
    true
  end
end

Value.new("foo") + Value.new("bar")
# >> called #<struct Value value="foo"> + #<struct Value value="bar">
Value.new("foo") + "bar"
# >> called #<struct Value value="foo"> + "bar"
"foo" + Value.new("bar")
# ~> TypeError: no implicit conversion of Value into String
1 + Value.new(2)
# >> called #<struct Value value=2>#coerce(1)
# >> called #<struct Value value=1> + #<struct Value value=2>

"foo" =~ Value.new("bar")
# >> called #<struct Value value="bar"> =~ "foo"
1 =~ Value.new(2)
# nothing called (nil is returned)

Value.new("foo") >= Value.new("bar") # => nil
# >> called #<struct Value value="foo"> >= #<struct Value value="bar">
"foo" >= Value.new("bar")
# ~> ArgumentError: comparison of String with Value failed
1 >= Value.new(2)
# >> called #<struct Value value=2>#coerce(1)
# >> called #<struct Value value=1> >= #<struct Value value=2>