Can't set empty string or zero number

When setting empty string or 0 (zero) value to a field it gets ignored.

Lets say you want to upload node content and set its status to unpublished - csv file would look something like this:

title,status
My new node, 0

or update node and set field value to empty, or zero:

nid,title,field_textfield,field_number
1,My updated node,,0

but fields whose value evaluates to FALSE are ignored.