Issue #14456 has been reported by Gondolin (Damien Robert).

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Bug #14456: Dir.glob with FNM_CASEFOLD gives ArgumentError: invalid byte sequence in UTF-8
https://bugs.ruby-lang.org/issues/14456

* Author: Gondolin (Damien Robert)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0p0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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With ruby 2.5.0p0, in a folder that contains a file encoded in latin-1, I get the following error:

~~~ ruby
Dir.glob('*a', File::FNM_CASEFOLD)
ArgumentError: invalid byte sequence in UTF-8
~~~

Note that `Dir.glob('*', File::FNM_CASEFOLD)`, `Dir.glob('a*', File::FNM_CASEFOLD)` and `Dir.glob('*')` work.



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