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I think there is no need to escape
[
and]
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[
and]
have special meaning in YAML, so I think you do need to escape at least the opening one, but I'm not sure, so let's try...There was a problem hiding this comment.
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#23741 to test
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Looks like the result there is malformed YAML and Travis doesn't kick off. Confirmed with https://codebeautify.org/yaml-validator that escaping is needed.
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You are right, I was tricked by https://github.com/primus/eventemitter3/blob/991b9454dd977cbfb327203a03885c8f721095e3/.travis.yml and many other similar cases but that works because the whole string is wrapped in
''
.