K 10 svn:author V 2 se K 8 svn:date V 27 2011-07-09T12:14:57.130967Z K 7 svn:log V 289 Some refactoring for easier maintenance of the code. This is a follow-up to re-establishment of 64bit arithmetic, but is committed separately, to not obscure that conversion. This commit does not change the observed behaviour of expr in any way. Style will be fixed in a follow-up commit. END