Language unique library features/changes

Languages often have different requirements or use cases depending on where they’re being built, and how objects are used in that language. I’m curious, is it okay for client libaries to make slight changes to the API or implementation of a client?

Specifically, something like this PR:

In this case, swift devs often keeps objects alive for the entirety of an app’s lifecycle. Having to re-init an object with new headers could cause memory leaks and unexpected behavior. But implementing a config object, or even public config variables, splits from the precedent set by the JS and Dart libraries.

Should this kind of change be okay? And I guess my suggestion would be: Can the client libraries follow the JS and Dart libraries as close as possible, but in the case where a change is necessary, keep API’s the same across the language?