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Wrong behavior of File.extname when the filename starts or ends with a period #5077

masahino opened this issue Sep 12, 2020 · 0 comments


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Behavior of File.extname is incompatible with CRuby.

In CRuby

$ irb
irb(main):001:0> File.extname('.a.rb')
=> ".rb"
irb(main):002:0> File.extname('foo.')
=> "."

In mruby

$ mirb
mirb - Embeddable Interactive Ruby Shell

> File.extname('.a.rb')
 => ""
> File.extname('foo.')
 => ".foo"

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