Stop disable/enable gc.

json and pickle modules don't stop gc. It's a very dirty hack.

msgpack/_msgpack.pyx

@@ -13,10 +13,6 @@ from libc.string cimport *
 from libc.limits cimport *
 
 
-import gc
-_gc_disable = gc.disable
-_gc_enable = gc.enable
-
 cdef extern from "pack.h":
     struct msgpack_packer:
         char* buf
@@ -242,11 +238,7 @@ def unpackb(object packed, object object_hook=None, object list_hook=None,
         if not PyCallable_Check(list_hook):
             raise TypeError("list_hook must be a callable.")
         ctx.user.list_hook = <PyObject*>list_hook
-    _gc_disable()
-    try:
-        ret = template_execute(&ctx, buf, buf_len, &off)
-    finally:
-        _gc_enable()
+    ret = template_execute(&ctx, buf, buf_len, &off)
     if ret == 1:
         return template_data(&ctx)
     else:
@@ -444,9 +436,7 @@ cdef class Unpacker(object):
         """unpack one object"""
         cdef int ret
         while 1:
-            _gc_disable()
             ret = template_execute(&self.ctx, self.buf, self.buf_tail, &self.buf_head)
-            _gc_enable()
             if ret == 1:
                 o = template_data(&self.ctx)
                 template_init(&self.ctx)