An untyped child-stream 'data' listener takes strings when a setEncoding
call on the same stream precedes it. A const alias of an access path
(`const out = child.stdout`) now resolves to that path, so a setEncoding
through one alias and a listener through another, or through the stream
itself, agree. A setEncoding on another receiver that can hold the same
stream (a let copy, a parameter, a call result) leaves the state unclear
and reports the existing SC1090. Receivers that name different members
of one root, or two const roots each initialized by a call or new, are
treated as different streams.
Chris Tate
8e87f6f9ef