Add _copy_cols flag to table

Author: giadarol

xdeps/table.py

@@ -201,6 +201,7 @@ def __init__(
         cast_strings=True,
         regex_flags=re.IGNORECASE,
         verify=True,
+        _copy_cols=False,
     ):
         if verify:
             _data = data.copy()
@@ -245,6 +246,11 @@ def __init__(
         for kk, vv in init.items():
             object.__setattr__(self, kk, vv)
 
+        if _copy_cols:
+            self._data = self._data.copy()
+            for kk in self._col_names:
+                self._data[kk] = self._data[kk].copy()
+
     @property
     def mask(self):
         raise DeprecationWarning(