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Original file line number	Diff line number	Diff line change
@@ -164,7 +164,7 @@ There is no control whether `toString()` returns exactly a string, or whether `S
`164`	`164`	`The only mandatory thing: these methods must return a primitive, not an object.`
`165`	`165`
`166`	`166`	```smart header="Historical notes"
`167`		-For historical reasons, if `toString` or `valueOf` return an object, there's no error, but such value is ignored (like if the method didn't exist). That's because in ancient times there was no good "error" concept in JavaScript.
	`167`	+For historical reasons, if `toString` or `valueOf` returns an object, there's no error, but such value is ignored (like if the method didn't exist). That's because in ancient times there was no good "error" concept in JavaScript.
`168`	`168`
`169`	`169`	In contrast, `Symbol.toPrimitive` must return a primitive, otherwise there will be an error.
`170`	`170`	```

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