1=== Quote boolean-like string (scalar)
2# Strings that could be confused with booleans should be quoted
3--- perl
4[ 'true' ]
5
6--- yaml
7\--- 'true'
8
9=== Quote boolean-like string (list)
10--- perl
11[ [ qw{ null true false } ] ]
12
13--- yaml
14\---
15- 'null'
16- 'true'
17- 'false'
18
19=== Quote scalars ending in colon
20--- perl
21[ [ 'A:' ] ]
22
23--- yaml
24\---
25- 'A:'
26
27