Union allows storage of a double, string or object
<br/> It is useful as a localobj in an obfunc since it will permit returning anything
<br/> It also makes it easy to pick up any kind of value out of a list, vector or array
<br/> USAGE: XO=new Union(val) where val can be a number string or object
<ul>
<li> XO=new Union(list,index) will pick up a string or object from list
<li> XO=new Union(vec,index) will pick up a number from vector
<li> XO=new Union(&dbl,index) will pick up a number from double array
</ul>
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