Remove redundant `to_s` calls

`clean_value`'s return value is a `String`. That method will return
`@value.to_s`, or it will call `Axlsx.sanitize`, which will return a
`String` in both conditions (

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/axlsx/workbook/worksheet/cell.rb b/lib/axlsx/workbook/worksheet/cell.rb
index b9f78fdb..3bb619c7 100644
--- a/lib/axlsx/workbook/worksheet/cell.rb
+++ b/lib/axlsx/workbook/worksheet/cell.rb
@@ -442,9 +442,10 @@ module Axlsx
       end
     end
 
-    # Returns the sanatized value
-    # TODO find a better way to do this as it accounts for 30% of
+    # Returns the sanitized value
+    # TODO: find a better way to do this as it accounts for 30% of
     # processing time in benchmarking...
+    # @return [String] The sanitized value
     def clean_value
       if (type == :string || type == :text) && !Axlsx::trust_input
         Axlsx::sanitize(::CGI.escapeHTML(@value.to_s))