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closes #2910

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Original file line number	Diff line number	Diff line change
`@@ -427,6 +427,7 @@ The "integer property" term here means a string that can be converted to-and-fro`
`427`	`427`	`So, "49" is an integer property name, because when it's transformed to an integer number and back, it's still the same. But "+49" and "1.2" are not:`
`428`	`428`
`429`	`429`	```js run
	`430`	`+// Number(...) explicitly converts to a number`
`430`	`431`	`// Math.trunc is a built-in function that removes the decimal part`
`431`	`432`	`alert( String(Math.trunc(Number("49"))) ); // "49", same, integer property`
`432`	`433`	`alert( String(Math.trunc(Number("+49"))) ); // "49", not same "+49" ⇒ not integer property`

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