Extending a framework (non-core) library

Extending core libraries in most cases is really simple:

1. Create a new class that extends the old class (or replace it altogether if there's an interface available), and modify it to do what you want.
2. Copy the method from system/Config/BaseServices to application/Config/Services.php, and modify it to return your new class.

Services docs should help clear that I up, I hope.

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