Simplify sequence_builder

Author: carver

trinity/utils/headers.py

@@ -1,26 +1,21 @@
 from typing import (
-    Iterator,
+    Tuple,
 )
 
-from eth_utils import to_tuple
-
 from eth.constants import UINT_256_MAX
 
 
-@to_tuple
 def sequence_builder(start_number: int,
                      max_length: int,
                      skip: int,
-                     reverse: bool) -> Iterator[int]:
+                     reverse: bool) -> Tuple[int, ...]:
     if reverse:
         step = -1 * (skip + 1)
     else:
         step = skip + 1
 
     cutoff_number = start_number + step * max_length
 
-    for number in range(start_number, cutoff_number, step):
-        if number < 0 or number > UINT_256_MAX:
-            return
-        else:
-            yield number
+    whole_range = range(start_number, cutoff_number, step)
+
+    return tuple(number for number in whole_range if 0 <= number <= UINT_256_MAX)