yaml string values are escaped unexpectedly

[olets]

String variables are escaped differently depending on whether they are set in Twig or YAML

This is works as expected:

{# main.twig #}
{% set str = '\-' %}
{{ str }} {# outputs `-` #}

This does not:

# yaml
str: '\-'

{# main.twig #}
{{ str }} {# outputs `\-` #}

Fiddle: https://twigfiddle.com/zeewkl

[olets]

This is not a YAML issue, backslash is automatically escaped in YAML. YAML str: \ --> JSON {"str": "\\"}. XML does too. Judging by testing INI on Twigfiddle, I bet that does too.