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Comment:
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I guess from a programmatic point of view a node name of _null_ is ok, but what about the string representation? I think a human readable version of the path is still important (standardized or not). For example see _MethodLevelValidationTest#cascadingArrayReturnValue_. The string version of the path is "cascadingArrayReturnValue.$retval[1].name". How would this look like with a _null_ node name. I guess _toString_ of PathImpl could somehow still insert a name like 'retval', but that seems inconsistent.
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