Banned characters in reference yaml configuration file

[Dego1n]

Is there any reason why character "7" is banned in reference file (.golangci.reference.yml) ?

It was added in #2520

This does not make any sense.

[ldez]

# This file contains all available configuration options
# with their default values (in comments).
#
# This file is not a configuration example,
# it contains the exhaustive configuration with explanations of the options.

https://github.com/golangci/golangci-lint/blob/d58f1401710f56d06e2a54e460f160f72b8499d2/.golangci.reference.yml#L1C1-L5C77