Quote is required even if it begins with backquote.

[k1LoW]

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Hi @goccy!

I noticed when using a mix of goccy/go-yaml and go-yaml/yaml that backquotes also cannot be used at the beginning of a token.

https://go.dev/play/p/ysabzaYClh3

I also got an error at https://www.yamllint.com/.

According to https://yaml.org/spec/1.2.2/ backquote (`) is reserved.

The “@” (x40, at) and “`” (x60, grave accent) are reserved for future use.

Thank you.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #440   +/-   ##
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  Coverage   76.02%   76.02%           
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  Files          13       13           
  Lines        4692     4692           
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  Hits         3567     3567           
  Misses        866      866           
  Partials      259      259