decoder: fix format error due to invalid argument (byte to string)
decoder: fix format error due to invalid argument (byte to string)

strivecast/hcl,KONTRAKT-DLL/hcl,glenjamin/hcl,savaki/hcl,hashicorp/hcl,strivecast/hcl,peter1000/hcl,ianremmler/hcl,jbaxleyiii/hcl,strivecast/hcl,hashicorp/hcl,strivecast/hcl,hashicorp/hcl,yudai/hcl,hashicorp/hcl,hashicorp/hcl,strivecast/hcl,wangtuanjie/hcl