GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/406
Bug: shorten links does not work with cluster ids
The shorten links function does not work with cluster ids because the 1st
character is 'r' which is deliberately not hex. Conversion to int base 16
results in NaN which generates a bad short id.
Although the feature is deprecated, it's still possible to enable it, so
the code should be able to cope. Simplest would be to return the mid unchanged
for cluster ids
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