snowball ASCII stemmer configuration

While I was updating the snowball code, I noticed something strange. In
src/backend/snowball/Makefile:

# first column is language name and also name of dictionary for
not-all-ASCII
# words, second is name of dictionary for all-ASCII words
# Note order dependency: use of some other language as ASCII dictionary
# must come after creation of that language
LANGUAGES= \
arabic arabic \
basque basque \
catalan catalan \
etc.

There are two cases where these two columns are not the same:

hindi english \
russian english \

The second one is old; the first one I added using the second one as
example. But I wonder what the rationale for this is. Maybe for hindi
one could make some kind of cultural argument, but for russian this
seems entirely arbitrary. Perhaps using "simple" would be more sound here.

Moreover, AFAIK, the following other languages do not use Latin-based
alphabets:

arabic arabic \
greek greek \
nepali nepali \
tamil tamil \

So I wonder by what rationale they use their own stemmer for the ASCII
fallback, which is probably not going to produce anything significant.

What's the general idea here?

--
Peter Eisentraut http://www.2ndQuadrant.com/
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