'The' capitalized after colon but not 'a'/'an'
I've noticed that, when using title case, 'the' gets capitalized after a colon (i.e. for a subtitle), but 'a' and 'an' do not. I am not sure about other styles, but the Chicago Manual of Style is clear that the first word of the subtitle is always supposed to be capitalized (see 8.163 for a specific example with 'a'). Unless there are any examples where doing this would cause a problem, is there any chance that these words could be treated the same way as 'the'?