System.Text.Json now provides the JsonSchemaExporter type, which supports generating a JSON schema that represents a .NET type.
System.Text.Json: The JsonObject type now exposes ordered-dictionary-like APIs that enables explicit property order manipulation
[GeneratedRegex] on properties
The Regex class provides a Split method, similar in concept to the String.Split method. With String.Split, you supply one or more char or string separators, and the implementation splits the input text on those separators.
Generic OrderedDictionary<TKey, TValue>
ReadOnlySet<T>
new Base64Url class
System.Diagnostics.Metrics now provides the Gauge instrument
NuGetAudit now raises warnings for vulnerabilities in transitive dependencies