Allow undefined where null is allowed

[steida]

Describe the feature request

Is there a reason why undefined isn't supported? My component has optional titleStyle, so it can be undefined.

Now I have to convert undefined to false titleStyle != null

<Text
  style={[
    styles.title,
    styles[variant],
    titleStyle != null && titleStyle,
    hovered && styles.titleHover,
    pressed && styles.titlePressed,
  ]}
>
  {title}
</Text>

[nmn]

undefined should be supported when used there. I'll look into it.

[steida]

@nmn Maybe it's because of exactOptionalPropertyTypes

https://github.com/Effect-TS/effect/tree/main/packages/schema#requirements

[nmn]

Thanks for catching this. Put up a PR with the fix.