While we're pipedreaming .... how about some way to validate streamed data against a schema? Offering such advanced features as ... an array with a single elem

While we're pipedreaming .... how about some way to validate streamed data against a schema? Offering such advanced features as ... an array with a single element? Or even crazier, enumerated values. Maybe even a way to transform streams using a selector-based query syntax. What a world ...