Canyon: more JSR-223 and the SimpleBindings

In order to make the widgets available as object during script execution, I have extended javax.script.SimpleBindings so that I lookup keys in the widget hierarchy before handing it down to the backing map by overriding the get() method. This was how I did it when using the Groovy implementation directly. I have discovered that javax.script requires that I override containsKey() as well as get(), otherwise it doesn’t even attempt to invoke get(). Now that is fixed in SVN and I am nearing the first public release of Canyon.


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