Remove memoryview usage

Since `struct.unpack_from` is already an offset-based approach at the
C level, and `result.extend` requires data copy anyway, avoiding a
`memoryview` wrapper prevents redundant Python object allocation and
pointer-shifting overhead, yielding optimal runtime memory footprint
and CPU performance.

Author: danny0838

Lib/zipfile/__init__.py

@@ -2717,20 +2717,19 @@ def _strip_extra_fields(data, field_ids):
             return result
 
         # use memoryview for zero-copy slices
-        mv = memoryview(data)
-        mv_len = len(mv)
+        data_len = len(data)
         pos = 0
-        while pos + 4 <= mv_len:
-            xid, xlen = struct.unpack_from('<HH', mv, pos)
-            if pos + 4 + xlen > mv_len:
+        while pos + 4 <= data_len:
+            xid, xlen = struct.unpack_from('<HH', data, pos)
+            if pos + 4 + xlen > data_len:
                 break
             if xid not in field_ids:
-                result.extend(mv[pos:pos + 4 + xlen])
+                result.extend(data[pos:pos + 4 + xlen])
             pos += 4 + xlen
 
         # keep remaining trailing bytes (e.g. truncated or malformed data)
-        if pos < mv_len:
-            result.extend(mv[pos:])
+        if pos < data_len:
+            result.extend(data[pos:])
 
         return result