JavaScript boy and “lovely thoughtleader” 
he/him 
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Normally for a union type, the rule is that any operation you do to T | U has to be valid for both T and U. So it seems like { ...x?.someObj } is a consistency violation because sometimes this evaluates as { ...undefined }
Depends how you define consistency? Seems like “undefined is only allowed as a spread value when in a union” seems like a consistent rule to me.
