Documentation about 'test_files' is confusing #90
According to the section in the guides that talks about
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- Remove test_files attribute since it's deprecated and no longer used. rubygems/guides#90 (comment) - Use Dir instead of git ls-files to specify gem files, in order to improve readability and exclude unnecessary files. - Don't include development files and RSpec tests in the built gem.
`Gem::Specification#test_files=` is no longer recommended. rubygems/guides#90 And it increases gem package size because the option adds test files to the package. So I think we should avoid using `test_files=` option. --- It reduces 4.7MB package size on my local. before ```bash $ du graphiql-rails-1.7.0/ --summarize 6.7M graphiql-rails-1.7.0/ ``` after ```bash $ du graphiql-rails-1.7.0/ --summarize 2.0M graphiql-rails-1.7.0/ ```