Optional Keys crash Xcode 16

[ConfusedVorlon]

It seems that optional keys are not caught by

		if (defaultValue as? _DefaultsOptionalProtocol)?._defaults_isNil == true {
			return
		}

The good news is that this is caught in the tests...

[ConfusedVorlon]

XCode 15.4 defines ExpressibleByNilLiteral

Conforming Types
[Optional]

XCode 16 states:

[Optional]
Conforms when Wrapped conforms to Escapable.

meanwhile, Escapable seems to have no requirements, but not to be available without

-enable-experimental-feature NonescapableTypes

If I do enable that feature, then compilation fails with a circular reference as soon as I include a key

[sindresorhus]

I recommend reporting this to Apple. It looks like a Swift bug.

[hank121314]

It seems to be the same as this issue: swiftlang/swift#74282

[sindresorhus]

You could use this workaround for now: 5434b04

It works as long as you don't use AnySerializable.

[ConfusedVorlon]

Brilliant - thank you.

[ConfusedVorlon]

fyi - not fixed on beta 2