Comment 1 for bug 1064978

Sorin I don't understand why you need the new signature with xs:string* since the current signatures should cover strings too, since the current signature is

declare %an:sequential function xqxq:bind-variable(
  $query-key as xs:anyURI,
  $var as xs:QName,
  $value as item()*) as empty-sequence() external ;

And sorry don't understand the problem, The query you attached is breaking because you are trying to attach a xs:string to a xs:integer variable.

declare variable $ext as xs:integer external := 0;
                                            ^
 In my eyes this is a correct error, but I don't know much xquery, is zorba supposed to do an automatic cast of the string to an integer?

                                                  ^