修复了大量存在的问题，增加了假鸭子类型等等机制

includes/mpool.py

@@ -5,7 +5,7 @@ import string
 
 MPOOL_ALIGN: t.CDefine = 8
 MPOOL_TYPE_SLAB: t.CDefine = 0
-MPOOL_TYPE_BUMP: t.CDefine = 2
+MPOOL_TYPE_BUMP: t.CDefine = 1
 
 
 def _align_up(val: t.CSizeT, align: t.CSizeT) -> t.CSizeT:
@@ -39,7 +39,6 @@ class MPool:
         self.alloc_map = None
         self.alloc_map_size = 0
 
-        if mem == None: return
         if block_size > 0:
             self._init_slab(mem, mem_size, block_size)
         else:
@@ -113,9 +112,7 @@ class MPool:
     def alloc(self, size: t.CSizeT) -> t.CVoid | t.CPtr:
         if self.mtype == MPOOL_TYPE_SLAB:
             return self._slab_alloc()
-        if self.mtype == MPOOL_TYPE_BUMP:
-            return self._bump_alloc(size)
-        return None
+        return self._bump_alloc(size)
 
     def alloc_buf(self, capacity: t.CSizeT) -> viperio.Buf | t.CPtr:
         ptr: t.CVoid | t.CPtr = self.alloc(capacity)