test_html_document_without_doctype fails with haml 6 and nokogiri 1.18

[boutil]

Hi,

In debian, the test test_html_document_without_doctype started failing. We use haml 6.3.0 and nokogiri 1.18.10.
When converting a html document without meta tag, there is no default value generated in the haml version.
Should we consider this as a bug? I could not find in the haml documentation that it is supposed to be generated in the haml version if not present in the originial html document.

  1) Failure:
Html2HamlTest#test_html_document_without_doctype [test/html2haml_test.rb:405]:
--- expected
+++ actual
@@ -1,7 +1,6 @@
 "!!!
 %html
   %head
-    %meta{:content => \"text/html; charset=UTF-8\", \"http-equiv\" => \"Content-Type\"}/
     %title Hello
   %body
     %p Hello"

See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1120233
I am tempted to either skip the test or "fix it" by removing the %meta line from the expected result, but I wonder if it is safe...
Thanks!