0 400   0   # comment
 1 400   0   
 0 400   0   key: value # comment
 1 400   0   
 0 400   0   colon:in:key: value
 1 400   0   
 2 400   0 + hanging_value:
 0 402   0 |   value
 1 400   0   
 0 400   0   1: 1
 1 400   0   
 0 400   0   true: true
 0 400   0