Producer pattern in data types

Src/AST/Myc.Ast.DataStream.pas

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+unit Myc.Ast.DataStream;
+
+interface
+
+uses
+    Myc.Data.Pipeline,
+    Myc.Data.Scalar;
+
+type
+    // 1. IStreamProducer (Source)
+    // Provides data. Corresponds to IProducer<T>.
+    IStreamProducer = IProducer<IScalarRecordSeries>;
+
+    // 2. IStreamConsumer (Sink)
+    // Consumes data. Corresponds to IConsumer<T>.
+    IStreamConsumer = IConsumer<IScalarRecordSeries>;
+
+    // 3. IStreamConverter (Transform/Pipe)
+    // Consumes AND provides data.
+    // IMPORTANT: Inherits from IProducer, allowing safe hard-casts to IStreamProducer.
+    IStreamConverter = IConverter<IScalarRecordSeries, IScalarRecordSeries>;
+
+implementation
+
+end.