In the UK (Edit: and in most \[all?] of the EU) no one uses the '.' notation for significant figures where the number to be truncated isn’t already a decimal number.
For example, in NA, 100 to 3 SF can be written as “100.” including the dot.
This convention isn’t recognised in the UK.
Instead, we would write 100 to 3SF as '100' (without the dot). This is currently only graded with partial marks, and when discovered by EU instructors is considered a bug by them.
It would be great to have a checkbox that could turn this off.