{{- if or .Params.author .Site.Params.author }}
{{- $author := (.Params.author | default .Site.Params.author)}}
{{- $author_type := (printf "%T" $author) }}
{{- if (eq $author_type "[]string") }}
{{- (delimit $author ", " ) }}
{{- else }}
{{- $author }}
{{- end }}
{{- end -}}