Diemo Schwarz

How must an atom be constructed by the attribute getter function of a js extension mxo such that it winds up as null in javascript code? Same question for undefined?

How must an atom be constructed by the attribute getter function of a js extension mxo such that it winds up as null in javascript code?  Same question for undefined?
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How must an atom be constructed by the attribute getter function of a js extension mxo such that it winds up as null in javascript code?  Sa

from jsextension code, how to return null or undefined?