add typeCast to cache key generation

Author: sidorares

lib/connection.js

@@ -442,7 +442,7 @@ Connection.prototype.resume = function resume () {
 
 Connection.prototype.keyFromFields = function keyFromFields (fields, options) {
   var res = (typeof options.nestTables) + '/' + options.nestTables + '/' + options.rowsAsArray
-    + options.supportBigNumbers + '/' + options.bigNumberStrings;
+    + options.supportBigNumbers + '/' + options.bigNumberStrings + '/' + typeof options.typeCast;
   for (var i = 0; i < fields.length; ++i) {
     res += '/' + fields[i].name + ':' + fields[i].columnType + ':' + fields[i].flags;
   }