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open firebug please

and try:
  
var someone = person();

someone._val

someone.name.filter(function(x) { return x.length < 11; })._val

someone.name.filter(function(x) { return x.length < 11; })._src

var someone_else = person();

someone.location.equals(someone_else.location).filter(IDENTITY)._src

someone.location.equals(someone_else.location)

someone.name.length.greaterThan(someone_else.name.length.add(3)) ...