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ReScript 10 / records with optional fields #766

Description

@cknitt

ReScript 10 will support records with optional fields. This would allow us to simplify a lot of things/move them closer to how they are done in JS.

E.g., styles: Instead of

let styles = StyleSheet.create({
  open Style
  {
    "statusBar": style(
      ~flexDirection=#row,
      ~height=dp(22.),
      ~alignItems=#center,
      ~paddingLeft=dp(12.),
      (),
    ),
    "text": style(~color=NativeColors.white, ~marginLeft=dp(4.), ()),
  }
})

we could have

let styles = StyleSheet.create({
  open Style
  {
    "statusBar": style({
      flexDirection: #row,
      height: dp(22.),
      alignItems: #center,
      paddingLeft: dp(12.),
    }),
    "text": style({
      color: "white",
      marginLeft: dp(4.),
    }),
  }
})

Or for APIs taking some config object, like

Share.share(Share.content(~title="Title", ~url="https://example.com", ()))

we could have

Share.share({title: "Title", url: "https://example.com"})

@MoOx For me the question is, can these be breaking changes or should we try to remain compatible with the existing way where possible?

If we go for breaking changes, then we could also do #748 at the same time.

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