IronRuby 4.0: the version follows the Ruby version it implements - #2

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'IObjectReference' is obsolete: 'Formatter-based serialization is obsolete and should not be used.' (https://aka.ms/dotnet-warnings/SYSLIB0050)

'Range.Subclass.Freeze()' hides inherited member 'Range.Freeze()'. Use the new keyword if hiding was intended.

'Range.Subclass.IsUntrusted' hides inherited member 'Range.IsUntrusted'. Use the new keyword if hiding was intended.

'Range.Subclass.IsTainted' hides inherited member 'Range.IsTainted'. Use the new keyword if hiding was intended.

'Range.Subclass.IsFrozen' hides inherited member 'Range.IsFrozen'. Use the new keyword if hiding was intended.

'SynchronizedDictionary<string, Scope>' is obsolete: 'Use System.Collections.Concurrent.ConcurrentDictionary<TKey, TValue> instead.'

'RubyRegex.Subclass.Freeze()' hides inherited member 'RubyRegex.Freeze()'. Use the new keyword if hiding was intended.

'RubyRegex.Subclass.IsUntrusted' hides inherited member 'RubyRegex.IsUntrusted'. Use the new keyword if hiding was intended.

'RubyRegex.Subclass.IsTainted' hides inherited member 'RubyRegex.IsTainted'. Use the new keyword if hiding was intended.