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Fix querying absolute domain name twice - #8
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Add more assertions to actually test that the ndots option is working as expected: the option controls the threshold that the search list should be attempted earlier or later.
When search list is not explicitly specified, Resolv::DNS checks the local domain name of the running system. If it is not set either, the root domain ['.'] is used. This is conceptually correct, but the code handles the absolute name separately, which in turn creates a duplicate query.
The current code works, but the intention was not clear at first glance.
Label.split maps both "." and "" to the root label list, so a resolv.conf carrying `search .` produces a search entry that reproduces the absolute name. Tidying up ndots handling dropped the include?(fname) guard that used to suppress the resulting duplicate query. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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When search list is not explicitly specified, Resolv::DNS checks the local domain name of the running system. If it is not set either, the root domain ['.'] is used.
This is conceptually correct, but the code handles the absolute name separately, which in turn creates a duplicate query.