update to ensure self._geographic_crs will be a pyproj CRS object. Li…

…kely a lot more could be done here to error catch but this could be reasonably robust as is

morecantile/models.py

@@ -499,7 +499,7 @@ def __init__(self, **data):
         """Set private attributes."""
         super().__init__(**data)
 
-        self._geographic_crs = data.get("_geographic_crs", WGS84_CRS)
+        self._geographic_crs = pyproj.CRS.from_user_input(data.get("_geographic_crs", WGS84_CRS))
 
         try:
             self._to_geographic = pyproj.Transformer.from_crs(