From e4ce734ef5de99fd4afbd8d568a7f4924733f440 Mon Sep 17 00:00:00 2001
From: Kevin Beaty <kevin@simplectic.com>
Date: Thu, 12 Mar 2015 07:15:30 -0500
Subject: [PATCH] Remove _symTransformer until official spec is worked out.

Prompted by cognitect-labs/transducers-js#20 from @tgriesser, removing
the internal transformer symbol until issues are worked out. This symbol
is currently only supported in jlongster/transducers.js and
interoperability is questionable as (Symbol('transformer') !==
Symbol('transformer')).

This feature was not documented, nor do the tests depend on it, and
only effects an undocumented feature of into. Better to remove it now
until details are worked out.  If an "official spec" is agreed upon,
I will open a new PR.
---
 src/internal/_isTransformer.js  | 6 +-----
 src/internal/_stepCat.js        | 3 +--
 src/internal/_symTransformer.js | 1 -
 3 files changed, 2 insertions(+), 8 deletions(-)
 delete mode 100644 src/internal/_symTransformer.js

diff --git a/src/internal/_isTransformer.js b/src/internal/_isTransformer.js
index 1496d4b0a..87ef76fc6 100644
--- a/src/internal/_isTransformer.js
+++ b/src/internal/_isTransformer.js
@@ -1,7 +1,3 @@
-var _symTransformer = require('./_symTransformer');
-
-
 module.exports = function _isTransformer(obj) {
-    return (obj[_symTransformer] != null) ||
-        (typeof obj.step === 'function' && typeof obj.result === 'function');
+    return (typeof obj.step === 'function' && typeof obj.result === 'function');
 };
diff --git a/src/internal/_stepCat.js b/src/internal/_stepCat.js
index 38ad87017..5f0ca5733 100644
--- a/src/internal/_stepCat.js
+++ b/src/internal/_stepCat.js
@@ -1,7 +1,6 @@
 var _add = require('./_add');
 var _appendTo = require('./_appendTo');
 var _isTransformer = require('./_isTransformer');
-var _symTransformer = require('./_symTransformer');
 var isArrayLike = require('../isArrayLike');
 var merge = require('../merge');
 
@@ -38,7 +37,7 @@ module.exports = (function() {
 
   return function _stepCat(obj) {
       if (_isTransformer(obj)) {
-          return obj[_symTransformer] || obj;
+          return obj;
       }
       if (isArrayLike(obj)) {
           return _stepCatArray;
diff --git a/src/internal/_symTransformer.js b/src/internal/_symTransformer.js
deleted file mode 100644
index 7af761292..000000000
--- a/src/internal/_symTransformer.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = (typeof Symbol !== 'undefined') ? Symbol('transformer') : '@@transformer';