Follow-up Comment #2, bug #48481 (project gettext):

My code build alternative IDs looking for these chars: '.', '_', '-', '@'.
So, if locale is "foo@bar@baz", we have this list of IDs:
- "foo@bar@baz"
- "foo@bar"
- "foo"

Instead of storing copies of the string, I save the position of the stop
chars. In the above case, we'll have these values:
- locale_lengths_count = 3
- locale_lengths[0] = 11
- locale_lengths[1] = 7
- locale_lengths[2] = 3

When looking for the plural rule, the code compares the IDs using each of
these locale_lengths using xmlStrncmp and stops at the first match.

So, if someone specify "en@us", the code won't convert it to "en-us", but
simply looks for "en@us" and "en".

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