nl_tokens: Copies data from one object to another .
pl_tokens: function _objectCopy ( sourceRef , copyRef , rc ) { let origIndex = rc . xStack . indexOf ( sourceRef ) ; if ( origIndex === - 1 ) { rc . <mask> ( sourceRef , copyRef ) ; for ( let [ key , val ] of _entries ( sourceRef ) ) copyRef [ key ] = _clone ( val , rc ) ; let symbols = Object . getOwnPropertySymbols ( sourceRef ) ; for ( let symbol of symbols ) copyRef [ symbol ] = _clone ( sourceRef [ symbol ] , rc ) ; rc . pop ( ) ; return copyRef ; } else return rc . yStack [ origIndex ] ; }