Runtime Configuration Trait
The configuration trait is a way for you to allow external pallets to define the element types being used on your internal pallet.
substrate_ is taking full advantage of the extensibility features of Rust by implementing the Config object as a trait.
The best practice when building your pallet is to implement Generic Types.
This will allow you to create all the functionality you want while leaving the concrete types a decision made at runtime.
The Configutation Trait is the way that substrate_ empowers the use of that extensible framework writing.
The Configuration Trait definition is a requirement for all pallets.
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