CGFloat/Double not interchangeable in protocol implementation?

[young (rtSwift)]

CGFloat and Double should be interchangeable since this has been implemented in Swift 5.5:

Pitch: Allow interchangeable use of `CGFloat` and `Double` types

Pitch: Allow interchangeable use of CGFloat and Double types Implementation: PR https://github.com/apple/swift/pull/34401 based on the main branch. Toolchains are available for macOS and Linux. Motivation When Swift was first released, the type of CGFloat presented a challenge. At the time, most iOS devices were still 32-bit. SDKs such as CoreGraphics provided APIs that took 32-bit floating point values on 32-bit platforms, and 64-bit values on 64-bit platforms. When these APIs were first int…