Look into whether we should rename "context cancelled"

[mstoykov]

In the js package we have an errInterrupted it is used to signal that we interrupted the iteratiosn. Unfortunately sometimes we get "context canceled"(one l not two) which is from when a context gets canceled

=== RUN   TestVURunInterruptDoesntPanic/Archive
    TestVURunInterruptDoesntPanic/Archive: assertions.go:247: ^M                          ^M    Error Trace:    runner_test.go:625
        ^M                      ^M                      asm_amd64.s:1373
        ^M      Error:          "context canceled" does not contain "context cancelled"
        ^M      Test:           TestVURunInterruptDoesntPanic/Archive
--- FAIL: TestVURunInterruptDoesntPanic (10.22s)

This seems like a slight race .. but ultimately I think it doesn't matter it will just be better if we make ours be single l as well but this needs more investigation I think :D

[na--]

is anything going to break if we fix the spelling of our error? if not, we should just do it :)

[mstoykov]

No idea, no time to check it all .. just I got it the second time today and decided to write it down while not trying to fix that as well :D