Use a fused type

Author: cpcloud

pandas/lib.pyx

@@ -899,13 +899,29 @@ def clean_index_list(list obj):
 
     return maybe_convert_objects(converted), 0
 
+
+ctypedef fused pandas_t:
+    str
+    unicode
+    float32_t
+    float64_t
+    uint8_t
+    uint16_t
+    uint32_t
+    uint64_t
+    int8_t
+    int16_t
+    int32_t
+    int64_t
+
+
 @cython.boundscheck(False)
 @cython.wraparound(False)
-def max_len_string_array(ndarray[object] arr):
+def max_len_string_array(pandas_t[:] arr):
     """ return the maximum size of elements in a 1-dim string array """
     cdef:
         Py_ssize_t i, m = 0, l = 0, length = arr.shape[0]
-        object v
+        pandas_t v
 
     for i in range(length):
         v = arr[i]