want to use Maybe
Install-Package Haskellable -Version 126.96.36.199
dotnet add package Haskellable --version 188.8.131.52
<PackageReference Include="Haskellable" Version="184.108.40.206" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Haskellable --version 220.127.116.11
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