fix: Fix "legacy" enums breaking Swift compiler

[mrousavy]

Previously, we only tested a string enum (discriminating union):

type Powertrain = 'gas' | 'electric'

Now, we also test an "old" enum, aka an enum backed by a number:

enum Powertrain { GAS, ELECTRIC }

This is a slightly different implementation on the native side, since we now use the number as a value of truth.

On iOS, for some reason this breaks when using std::optional<Enum>.

This code breaks:

      self.__implementation.optionalOldEnum = newValue.value

This code works:

      self.__implementation.optionalOldEnum = newValue.has_value() ? newValue.pointee : nil

So this PR fixes this. And adds a test.

[vercel]

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