Optional
Internal
Used internally by Composer. If set and includes an explicit version, that overrides the version option.
version
Control the logging level during parsing
Default: 'warn'
'warn'
The YAML version used by documents without a %YAML directive.
%YAML
Default: "1.2"
"1.2"
Used internally by Composer. If set and includes an explicit version, that overrides the
version
option.