Add isErrored() function #45
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Add isErrored() function so we can tell if the context / connection is in the "errored" state, as may occur if the initial TCP connection fails.
(This commit has been sitting in my fork for 18 months, not sure why I never turned it into a PR before - doing it now in preparation for tidying up my repo list as I move slowly to codeberg. I can't actually remember why I needed this, but I'm pretty sure I did - if you'd like me to go digging for the calling code I used it in to demonstrate the requirement, let me know!)