How to specify ranges in YAML?

Question

I can express

3rd page is the title page

in YAML

title: 3

What about the following?

Answer 1

There is not direct way to specify ranges in YAML, but some YAML can store serialized objects, for example in Ruby:

...
normal range: !ruby/range 10..20 
exclusive range: !ruby/range 11...20 
negative range: !ruby/range -1..-5 
...

Look here