[Repo Assist] Add PreferOptionals parameter to XmlProvider and JsonProvider#1660

dsyme merged 5 commits intomainfsprojects/FSharp.Data:mainfrom

repo-assist/fix-issue-649-prefer-optionals-xml-json-437b1fa1ff587b4dfsprojects/FSharp.Data:repo-assist/fix-issue-649-prefer-optionals-xml-json-437b1fa1ff587b4dCopy head branch name to clipboard