Remove redundant downcase from _layouts/categories.html #4531
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abundant code
This is an enhancement or feature.
Summary
Context
"slugify" filter calls "Utils.slugfy" without "cased" parameter,
which set to "false" default value.
So "downcase" filter following "slugify seems rebundant.
https://github.com/jekyll/jekyll/blob/master/lib/jekyll/filters.rb#L62
https://github.com/jekyll/jekyll/blob/master/lib/jekyll/utils.rb#L202