What kind of methods should *not* be converted into endless methods? Methods that call `puts`? Methods include `==`? Methods with many args? How complex can a single-line method get before it should not be converted into an endless method?
Personally I think that methods who's body is a single equals comparison (ex: `@foo == 42`) look confusing when converted into an endless method due to the combination of `=` symbols.
def forty_two? = @foo == 42
vs.
def forty_two?
@foo == 42
end