From 2c6668941f72e3bcb797d096437683eca4e3caf5 Mon Sep 17 00:00:00 2001
From: Inada Naoki <songofacandy@gmail.com>
Date: Tue, 3 Dec 2019 21:18:17 +0900
Subject: Intern map keys (#381)

Fixes #372.
---
 msgpack/unpack.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'msgpack/unpack.h')

diff --git a/msgpack/unpack.h b/msgpack/unpack.h
index 539a991..ead5095 100644
--- a/msgpack/unpack.h
+++ b/msgpack/unpack.h
@@ -192,6 +192,9 @@ static inline int unpack_callback_map_item(unpack_user* u, unsigned int current,
         PyErr_Format(PyExc_ValueError, "%.100s is not allowed for map key", Py_TYPE(k)->tp_name);
         return -1;
     }
+    if (PyUnicode_CheckExact(k)) {
+        PyUnicode_InternInPlace(&k);
+    }
     if (u->has_pairs_hook) {
         msgpack_unpack_object item = PyTuple_Pack(2, k, v);
         if (!item)
-- 
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