What's New in C# 13: Enhanced Params, Performance Boosts, and New Extension Types
Briefly

In C# 13, the params keyword is extended to accept any collection type compatible with collection expressions, enabling methods to receive a comma-separated list of values.
Performance improvements in C# 13 include the implicit conversion of values in params to span type to enhance method efficiency, especially when overloaded methods differ in span or array usage.
Read at InfoQ
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