aria-disabled is either true or false.

m-e-h · jonathantneal · commit b8f007f4e3de · 2018-10-07T08:07:58.000-04:00
diff --git a/sanitize.css b/sanitize.css
@@ -572,7 +572,7 @@ textarea,
  * inoperable elements in all browsers (opinionated).
  */
 
-[aria-disabled],
+[aria-disabled="true"],
 [disabled] {
   cursor: not-allowed;
 }

Original file line number	Diff line number	Diff line change
`@@ -572,7 +572,7 @@ textarea,`
`572`	`572`	`* inoperable elements in all browsers (opinionated).`
`573`	`573`	`*/`
`574`	`574`
`575`		`-[aria-disabled],`
	`575`	`+[aria-disabled="true"],`
`576`	`576`	`[disabled] {`
`577`	`577`	`cursor: not-allowed;`
`578`	`578`	`}`