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[chore] replace deprecated String.prototype.substr()

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[String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated so we replace it with [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice) which works similarily but isn't deprecated. .substr() probably isn't going away anytime soon but the change is trivial so it doesn't...

[String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated so we replace it with [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice) which works similarily but isn't deprecated. .substr() probably isn't going away anytime soon but the change is trivial so it doesn't...

chore: replace deprecated String.prototype.substr()

2

**What**: Replacing usage of `.substr()` with `.slice()` **Why**: [String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated. **Checklist**: - [ ] Documentation N/A - [ ] Added/updated unit tests N/A - [x] Code complete

Replace deprecated String.prototype.substr()

1

[String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated so we replace it with [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice) which works similarily but isn't deprecated. .substr() probably isn't going away anytime soon but the change is trivial so it doesn't...

Use the proper function to get the original hash via the API. The current implementation just returns `None `all the time, basically skipping the hash check.

This PR contains a: - [x] **bugfix** - [ ] new **feature** - [x] **code refactor** - [ ] **test update** - [ ] **typo fix** - [ ] **metadata...

[String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated so we replace it with [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice) which works similarily but isn't deprecated. .substr() probably isn't going away anytime soon but the change is trivial so it doesn't...

[String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated so we replace it with [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice) which works similarily but isn't deprecated. .substr() probably isn't going away anytime soon but the change is trivial so it doesn't...

[String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated so we replace it with [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice) which works similarily but isn't deprecated. .substr() probably isn't going away anytime soon but the change is trivial so it doesn't...

[String.prototype.substr()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) is deprecated so we replace it with [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice) which works similarily but isn't deprecated. .substr() probably isn't going away anytime soon but the change is trivial so it doesn't...