I’m confused by this table in the docs. The last column is identical for rows 1,3 (import MyModule and using MyModule), which seems inconsistent with the previous paragraph: import also differs from using in that functions imported using import can be extended with new methods.

The last statement means that functions imported via import are available for extension without the additional module qualifier, i.e. it refers to the last column of rows 2, 4 and 5.