nl_tokens: The base implementation of _ . set .
pl_tokens: function baseSet ( object , path , value , customizer ) { if ( ! isObject$2 ( object ) ) { return object ; } path = isKey$2 ( path , <mask> ) ? [ path ] : castPath$2 ( path ) ; var index = - 1 , length = path . length , lastIndex = length - 1 , nested = object ; while ( nested != null && ++ index < length ) { var key = toKey$2 ( path [ index ] ) , newValue = value ; if ( index != lastIndex ) { var objValue = nested [ key ] ; newValue = customizer ? customizer ( objValue , key , nested ) : undefined ; if ( newValue === undefined ) { newValue = isObject$2 ( objValue ) ? objValue : ( isIndex$1 ( path [ index + 1 ] ) ? [ ] : { } ) ; } } assignValue ( nested , key , newValue ) ; nested = nested [ key ] ; } return object ; }