“—no-rdoc —no-ri” are long deprecated rubygem install options and will break in Ruby 2.6.0 with RubyGems 3.0 use “—no-document” instead.
@timcase Thanks for the tip. My ~/.gemrc had `--no-ri --no-rdoc` but it was ignored and I didn't noticed that docs were still installed! `--no-document` fixes it.
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