fix: update retain_type signature and remove test_fastai

Author: Rens Dimmendaal

fasttransform/utils.py

@@ -52,7 +52,7 @@ def cast(x, typ):
     return retain_meta(x, res)
 
 # %% ../nbs/00_utils.ipynb 18
-def retain_type(new, old, ret_type,as_copy=False):
+def retain_type(new, old, ret_type=Any,as_copy=False):
     if new is None: return new
     if ret_type is NoneType: return new
     if ret_type is Any:

nbs/00_utils.ipynb

@@ -231,7 +231,7 @@
    "outputs": [],
    "source": [
     "#|export\n",
-    "def retain_type(new, old, ret_type,as_copy=False):\n",
+    "def retain_type(new, old, ret_type=Any,as_copy=False):\n",
     "    if new is None: return new\n",
     "    if ret_type is NoneType: return new\n",
     "    if ret_type is Any:\n",