C#

Use C# required members to express caller-owned initialization without confusing compile-time enforcement with validation or non-null guarantees.

Use C# collection expressions deliberately by understanding target typing, spread evaluation, overload ambiguity, and allocation behavior.

Use C# primary constructors without confusing parameters with properties, duplicating state, or weakening validation and dependency boundaries.

Use C# exception filters, precise catch clauses, and correct rethrow semantics to preserve diagnostics and handle only failures your code understands.

Use C# generic math and static abstract interface members to express numeric capabilities without duplicating algorithms or accepting invalid operations.

Design C# buffer APIs with Span, Memory, explicit ownership, and lifetime rules that remain safe across synchronous and asynchronous work.

Implement C# equality and hash codes as one stable contract so records, value objects, dictionaries, and sets behave predictably in production.

Use nullable annotations, flow analysis, guard clauses, and Try-pattern attributes to make absence explicit without confusing compiler warnings with runtime validation.

Use C# type, property, relational, and list patterns to make branching code clearer without turning ordinary conditions into clever syntax.

Design and consume IAsyncEnumerable streams in C# with correct cancellation, disposal, paging, and failure semantics.