Issue #174 has been updated by Arthur Schreiber.
That is definately a bug, as earlier Ruby 1.8.6 patchlevels showed
exactly the same behaviour as 1.8.7:
VERSION = 1.8.6-p111:
irb(main):001:0> File.extname(".profile")
=> ""
VERSION = 1.8.6-p114
irb(main):001:0> File.extname(".profile")
=> ""
VERSION = 1.8.6-p166
irb(main):001:0> File.extname(".profile")
=> ""
VERSION = 1.8.6-p222
irb(main):001:0> File.extname(".profile")
=> ".profile"
VERSION = 1.8.7-p17
irb(main):001:0> File.extname(".profile")
=> ""
VERSION = 1.8.7-p7
irb(main):001:0> File.extname(".profile")
=> ""
VERSION = 1.8.7
irb(main):001:0> File.extname(".profile")
=> ""
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http://redmine.ruby-lang.org/issues/show/174
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