Override dependency inline

[sk409]

The new API for overriding dependencies is clear as it corresponds to SwiftUI's Environment, but the instance used for overriding must be created elsewhere.

MyFeature()
  // mockAPIClient must be created elsewhere.
  .dependency(mockAPIClient)

Currently, it seems that there is no API equivalent to transformDependency(_:transform:) as shown below.

MyFeature()
  .transformDependency(MockAPIClient()) {
    $0.endpoint = ~
  } 

Are there any disadvantages to implementing the above transformDependency?
I'm willing to implementing the above transform Dependency and creating a PR.