Version Used:
Latest master source

I found out we use different editorconfig strings for severities specified through our code style options and the ones that the compiler looks for:

So, user needs to use different terms for specifying severies, which seems very confusing:

[*.cs]

# CA1822: Mark members as static
dotnet_diagnostic.CA1822.severity = warn

# IDE0059: Unnecessary assignment of a value
csharp_style_unused_value_assignment_preference = discard_variable:warning

Compiler generates the following diagnostic if term warning is used for dotnet_diagnostic.CA1822.severity

CSC : warning InvalidSeverityInAnalyzerConfig: The diagnostic 'ca1822' was given an invalid severity 'warning' in the analyzer config file

IDE code style:
Documentation: https://docs.microsoft.com/en-us/visualstudio/ide/editorconfig-code-style-settings-reference?view=vs-2019#language-code-styles
Implementation: http://source.roslyn.io/#Microsoft.CodeAnalysis.Workspaces/NamingStyles/EditorConfig/EditorConfigSeverityStrings.cs,5

Compiler:

I believe the compiler terms should be switched to follow the already shipped terminology or at least the compiler should allow the terms from both columns in the table above