PyYAML interprets yes, no, on, off as Boolean

[sergio-nsk]

How to disable this behavior?
10.2.1.2. Boolean

Canonical Form

Either true or false.

What is a reason of such behavior? The valid YAML

bool: [true, false, on, off, yes, no]

is converted to the invalid dictionary

{'bool': [True, False, True, False, True, False]}

but expected to be converted to the dictionary

{'bool': [True, False, 'on', 'off', 'yes', 'no']}

The similar invalid behavior, the YAML

true: 1
false: 0
on: 1
off: 0
yes: 1
no: 0

results in the invalid dictionary

{True: 1, False: 0}

but expected

{True: 1, False: 0, 'on': 1, 'off': 0, 'yes': 1, 'no': 0}

[perlpunk]

That's correct behavior.
pyyaml implements YAML 1.1
You linked to the YAML 1.2 JSON Schema for some reason.
Here's a compact doc of 1.1 and 1.2 schemas:
https://perlpunk.github.io/yaml-test-schema/schemas.html

#486