As other posts have said, it doesn't look like barewords as hash keys are going away any time soon.
As long as everyone knows when they must quote hash keys, then I wouldn't make a big deal out of it.
If you can persuade everyone to use/agree on a set of coding standards and style, that's a good thing. It isn't always easy though.
It my experience, things like quoting hash keys, bracketing/brace styles and the like aren't worth worrying about - concentrate on hassling/convincing your colleagues to build well engineered, robust, easily maintained code and let trival style issues slide.
If the information in this post is inaccurate, or just plain wrong, don't just downvote - please post explaining what's wrong.
That way everyone learns.
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