msgpack
diff --git a/‎msgpack/_packer.pyx
Lines changed: 13 additions & 2 deletions b/‎msgpack/_packer.pyx
Lines changed: 13 additions & 2 deletions
diff --git a/‎msgpack/fallback.py
Lines changed: 3 additions & 2 deletions b/‎msgpack/fallback.py
Lines changed: 3 additions & 2 deletions
diff --git a/‎test/test_pack.py
Lines changed: 7 additions & 0 deletions b/‎test/test_pack.py
Lines changed: 7 additions & 0 deletions
@@ -10,6 +10,8 @@ from msgpack import ExtType
 cdef extern from "Python.h":
 
     int PyMemoryView_Check(object obj)
+    int PyByteArray_Check(object obj)
+    int PyByteArray_CheckExact(object obj)
 
 
 cdef extern from "pack.h":
@@ -39,6 +41,14 @@ cdef int DEFAULT_RECURSE_LIMIT=511
 cdef size_t ITEM_LIMIT = (2**32)-1
 
 
+cdef inline int PyBytesLike_Check(object o):
+    return PyBytes_Check(o) or PyByteArray_Check(o)
+
+
+cdef inline int PyBytesLike_CheckExact(object o):
+    return PyBytes_CheckExact(o) or PyByteArray_CheckExact(o)
+
+
 cdef class Packer(object):
     """
     MessagePack Packer
@@ -174,10 +184,11 @@ cdef class Packer(object):
                 else:
                    dval = o
                    ret = msgpack_pack_double(&self.pk, dval)
-            elif PyBytes_CheckExact(o) if strict_types else PyBytes_Check(o):
+            elif PyBytesLike_CheckExact(o) if strict_types else PyBytesLike_Check(o):
                 L = len(o)
                 if L > ITEM_LIMIT:
-                    raise PackValueError("bytes is too large")
+                    raise PackValueError("%s is too large"
+                                         % type(o).__name__.capitalize())
                 rawval = o
                 ret = msgpack_pack_bin(&self.pk, L)
                 if ret == 0:
 
@@ -728,10 +728,11 @@ def _pack(self, obj, nest_limit=DEFAULT_RECURSE_LIMIT,
                     default_used = True
                     continue
                 raise PackOverflowError("Integer value out of range")
-            if check(obj, bytes):
+            if check(obj, (bytes, bytearray)):
                 n = len(obj)
                 if n >= 2**32:
-                    raise PackValueError("Bytes is too large")
+                    raise PackValueError("%s is too large"
+                                         % type(obj).__name__.capitalize())
                 self._pack_bin_header(n)
                 return self._buffer.write(obj)
             if check(obj, Unicode):
 
@@ -58,6 +58,13 @@ def testPackBytes():
     for td in test_data:
         check(td)
 
+def testPackByteArrays():
+    test_data = [
+        bytearray(b""), bytearray(b"abcd"), (bytearray(b"defgh"),),
+        ]
+    for td in test_data:
+        check(td)
+
 def testIgnoreUnicodeErrors():
     re = unpackb(packb(b'abc\xeddef'), encoding='utf-8', unicode_errors='ignore', use_list=1)
     assert re == "abcdef"