UX: No obvious way to enter null value when in update mode

[mipjones]

When in update mode, for example:

UPDATE: SELECT * FROM SAMPLE.EMPLOYEE

When we need to edit a null capable database column by changing its current value to a null, there is no obvious way to do so. Typing "null" with the keyboard will result in an alphanumeric string "null" being entered rather than null flag/special value.

Perhaps a way to enter a null already exists, but I was not successful finding and searching any documentation about DB2i extension beyond its README.md.