https://devblogs.microsoft.com/dotnet/advisory-serializing-deserializing-a-cultureawarecomparer-with-net-framework-4-6/
Advisory serializing/deserializing a CultureAwareComparer with .NET Framework 4.6+ - .NET Blog
Feb 20, 2019 - An issue with serializing/deserializing a CultureAwareComparer was discovered with .NET Framework 4.7.1. This issue was resolved earlier this year, with the...
net frameworkadvisoryserializing