The category pragma is applied to the class, not the methods. Is there
even a reasonable usage model that need to _change_ the category of the
class? Also, if the block is a class extend [ ... ] a category pragma
inside will cause error.
To me, an extend block is just a grouping for methods, it probably makes
more sense to apply block level pragmas to all the methods within, as a
default value which can be overriden by local pragmas. This way at least
we can save some typing.