looseIdentical
in favor of built-in Object.is
(#37191)
Remove `looseIdentical` implementation and instead use the ES2015 `Object.is` in its place. They behave exactly the same way except for `+0`/`-0`. `looseIdentical(+0, -0)` => `true` `Object.is(+0, -0)` => `false` Other than the difference noted above, this is not be a breaking change because: 1. `looseIdentical` is a private API 2. ES2015 is listed as a mandatory polyfill in the [browser support guide](https://angular.io/guide/browser-support#mandatory-polyfills) 3. Also note that `Ivy` already uses `Object.is` in `bindingUpdated`. PR Close #37191
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