[wp-trac] [WordPress Trac] #38337: Unit Tests and fix for _canonical_charset() function

[WordPress Trac]

#38337: Unit Tests and fix for _canonical_charset() function
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 Reporter:  pbearne       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Charset       |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Just the unit tests and a small fix / tidy to handle mixed case strings

 Before the fix the string `Utf-8` and `Iso8859-1` returned incorrect
 values

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Ticket URL: <https://core.trac.wordpress.org/ticket/38337>
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