remove warnings with array concatenation; faster operation
remove warnings with array concatenation; faster operation

gjtorikian/asciidoctor,neontapir/asciidoctor,pepijnve/asciidoctor,anthonny/asciidoctor,yukisan/asciidoctor,glamouracademy/asciidoctor,cesarmarinhorj/asciidoctor,mjang/mj-asciidoc,asciidocfx/asciidoctor,glamouracademy/asciidoctor,benignbala/asciidoctor,gjtorikian/asciidoctor,benignbala/asciidoctor,mjang/mj-asciidoc,yukisan/asciidoctor,pepijnve/asciidoctor,cuit-zhaxin/asciidoctor,cuit-zhaxin/asciidoctor,anthonny/asciidoctor,asciidocfx/asciidoctor,neontapir/asciidoctor