title: Does Groovy have method to merge 2 maps?
body: <p>First map is default options <code>[a: true, b: false]</code>. Second map - options passed by user <code>[a:false]</code>. Does Groovy has maps merge method to obtain <code>[a: false, b:false]</code>?   </p>
  
  <p>It's not problem to implement it in Groovy. I'm asking about method out of the box</p>