Understanding exactly when a data.table is a reference to (vs a copy of) another data.table

rassignment-operatorreferencecopydata.table
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Error message "Strict standards: Only variables should be passed by reference"

phpreferencestrict
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haversinememory-addresscustom-componentselenium-firefoxdriverscrollbarsharedpreferencestagfileqt-designerfile-iologgingboost-spirit-qideserializationnaming-conventionsmasmpythonpathvertical-alignmentdetectclient-serveridiomsstring-concatenation