| This method evaluates the expression until a value (a non-Expression) object
is returned.
If the expression returns another expression, then the nested expression is evaluated.
Sometimes when Jelly is used inside Maven the value
of an expression can actually be another expression.
For example if a properties file is read, the values of variables
can actually be expressions themselves.
e.g. ${foo.bar} can lookup "foo.bar" in a Maven context
which could actually be another expression.
So using this method, nested expressions can be evaluated to the
actual underlying value object.
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