Tolerate non-Errors to allow for special exit signals and compatibili…

…ty with other flow control paradigms.

lib/waterline/methods/stream.js

@@ -2,7 +2,6 @@
  * Module dependencies
  */
 
-var util = require('util');
 var _ = require('@sailshq/lodash');
 var async = require('async');
 var flaverr = require('flaverr');
@@ -425,21 +424,8 @@ module.exports = function stream( /* criteria?, eachRecordFn?, explicitCbMaybe?,
 
           })(function _afterCallingIteratee(err){
             if (err) {
-
-              // Since this `err` might have come from the userland iteratee,
-              // we can't completely trust it.  So check it out, and if it's
-              // not one already, convert `err` into Error instance.
-              if (!_.isError(err)) {
-                if (_.isString(err)) {
-                  err = new Error(err);
-                }
-                else {
-                  err = new Error(util.inspect(err, {depth:5}));
-                }
-              }//>-
-
               return next(err);
-            }//--•
+            }
 
             // Increment the batch counter.
             i++;