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Improvement
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Resolution: Fixed
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Normal
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None
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None
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None
See http://musicbrainz.1054305.n4.nabble.com/TuneCore-ISRCs-revisited-td4650169.html
The linked PDF says "[...] these codes can now be regarded as compliant ISRCs. Users now have no reason to reject these codes as invalid." so we should stop rejecting them as invalid.