-- Make the typing of the Core cast operator more restrictive:    o Only singleton sequences are allowed    o Empty sequences are only allowed if the cast has a '?' occurrence indicator.
-- Make the typing of the Core cast operator more restrictive:
   o Only singleton sequences are allowed
   o Empty sequences are only allowed if the cast has a '?' occurrence indicator.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb