[FIX] fields: when computing digits, use an existing cursor instead of a new one

The computation of property `digits` was creating a new cursor to call the
function that determines digits.  This technique is fragile because the current
cursor may have pending updates that the new cursor will not see.

The issue was discovered by Cécile Tonglet (cto).  She observed an infinite
loop during a database migration, and a traceback inside the loop showed the
presence of the `digits` property.  This change fixes the infinite loop issue.

0 files changed, 0 insertions, 0 deletions