interface BindingRegistrar (View source)
| void | bind(string $key, string|callable $binder) Add a new route parameter binder. | |
| Closure | getBindingCallback(string $key) Get the binding callback for a given binding. | 
Add a new route parameter binder.
Get the binding callback for a given binding.
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    https://laravel.com/api/8.x/Illuminate/Contracts/Routing/BindingRegistrar.html