title: Any equivalent of Ruby's public_send method?
body: <p>In Ruby, to construct a method's name and send it to an object, one can do:</p>
  
  <pre><code>class Foo
    def foo
      "FOO"
    end
  end
  
  Foo.new.public_send(:foo)  # =&gt; "FOO"
  Foo.new.public_send("foo") # =&gt; "FOO"
  </code></pre>
  
  <p>What is equivalent technique for Crystal?</p>