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add: comment for reference

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Original file line number	Diff line number	Diff line change
`@@ -37,6 +37,7 @@ class BloomFilters {`
`37`	`37`	`}`
`38`	`38`
`39`	`39`	`// eslint-disable-next-line no-bitwise`
	`40`	`+ // To get a better hash. It may look useless but here is the explanation: https://stackoverflow.com/questions/38356644/why-is-the-bitwise-and-of-two-of-the-same-value-producing-a-different-value`
`40`	`41`	`hashVal &= hashVal;`
`41`	`42`
`42`	`43`	`return Math.abs(hashVal % this.size);`

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