Merge remote-tracking branch 'offical/master'

core/strings/strings.odin

@@ -1,4 +1,4 @@
-// Procedures to manipulate UTF-8 encoded strings
+// A `string` builder, as well as procedures to manipulate `UTF-8` encoded strings.
 package strings
 
 import "base:intrinsics"
@@ -436,8 +436,13 @@ equal_fold :: proc(u, v: string) -> (res: bool) {
 			return false
 		}
 
-		// TODO(bill): Unicode folding
-
+		r := unicode.simple_fold(sr)
+		for r != sr && r < tr {
+			r = unicode.simple_fold(sr)
+		}
+		if r == tr {
+			continue loop
+		}
 		return false
 	}