Inaccurate undefined stream stack traces

[janat08]

Doesnt try to atleast approximate where error occured in code say by way of whats in scope or callee although pointing at line of code would be nice.

index.js:214 Uncaught TypeError: Cannot read property '_remove' of undefined
    at Combine._stop (index.js:214)
    at Stream._x (index.js:847)
    at Stream._e (index.js:812)
    at CombineListener._e (index.js:167)
    at MemoryStream.Stream._e (index.js:816)
    at MapOp._e (index.js:650)
    at MemoryStream.Stream._e (index.js:816)
    at _try (index.js:34)
    at MapOp._n (index.js:641)
    at MemoryStream.Stream._n (index.js:797