[legacy-data-mixin] Ensure wildcard arguments get undefined treatment. Fixes #5428. #5522
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kevinpschaaf
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dfreedm,
sorvell and
TimvdLippe
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sorvell
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Apr 11, 2019
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When checking the results of
_marshalArgsforundefinedvalues, a wildcard argument would normally always have an object and thus would not trigger a warning even if the underlying base object wasundefined. In those cases check wildcard argument's base object forundefined, which would match Polymer 1's undefined rule behavior.Reference Issue
Fixes #5428.