adeven/pg-numhstore — pull request #17 by rapimo (2014-02-03 11:33:45+00:00)
Title: change div operastor to return null on division by zero

this changes

```SQL
SELECT 'a=>3, b=>2, c=>5'::inthstore / 'a=>2, b=>2, c=>0'::floathstore;
?column?
---------------------------------------------------------------------
"a"=>"1.5000000000000000", "b"=>"1.00000000000000000000", "c"=>NULL
(1 row)
```

to return a NULL value in the result instead raising `division by zero`