cimport uint64_t instead of using ctypedef

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 requires = [
     "setuptools",
-    "cython>=0.29.1,<0.30.0",
+    "cython>=0.29.1",
 ]
 build-backend = "setuptools.build_meta"

requirements.txt

@@ -1,6 +1,6 @@
 catalogue>=2.0.3,<2.1.0
 # Development requirements
-cython>=0.29.1,<0.30.0
+cython>=0.29.1
 pytest>=4.6.5
 pytest-timeout>=1.3.3,<2.0.0
 mock>=2.0.0,<3.0.0

setup.cfg

@@ -30,7 +30,7 @@ zip_safe = true
 include_package_data = true
 python_requires = >=3.6
 setup_requires =
-    cython>=0.29.1,<0.30.0
+    cython>=0.29.1
 install_requires =
     catalogue>=2.0.3,<2.1.0
 

srsly/msgpack/_unpacker.pyx

@@ -10,7 +10,7 @@ cdef extern from "Python.h":
 from libc.stdlib cimport *
 from libc.string cimport *
 from libc.limits cimport *
-ctypedef unsigned long long uint64_t
+from libc.stdint cimport uint64_t
 
 from .exceptions import (
     BufferFull,