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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()

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

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...

### Description [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...

[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...

refactor: 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...