fallback: performance: write(a+b) -> write(a); write(b)

Author: bwesterb

msgpack/fallback.py

@@ -430,7 +430,8 @@ def _pack(self, obj, nest_limit=DEFAULT_RECURSE_LIMIT):
                 obj = obj.encode(self.encoding, self.unicode_errors)
             n = len(obj)
             if n <= 0x1f:
-                return self.buffer.write(chr(0xa0 + n) + obj)
+                self.buffer.write(chr(0xa0 + n))
+                return self.buffer.write(obj)
             if n <= 0xffff:
                 return self.buffer.write(struct.pack(">BH%ds" % n,0xda, n, obj))
             if n <= 0xffffffff: