Use unit.name as key cache

src/pyFAI/geometry/core.py

@@ -766,6 +766,10 @@ def corner_array(self, shape=None, unit=None, use_cython=True, scale=True):
             space = "r"
             # unit = to_unit("r_m")
         key = space + "_corner"
+
+        if isinstance(unit, UnitFiber):
+            key = f"{unit.name}_corner"        
+
         if self._cached_array.get(key) is None or shape != self._cached_array.get(key).shape[:2]:
             with self._sem:
                 if self._cached_array.get(key) is None or shape != self._cached_array.get(key).shape[:2]:
@@ -920,8 +924,11 @@ def center_array(self, shape=None, unit="2th_deg", scale=True):
         """
 
         unit = to_unit(unit)
-        space = unit.name.split("_")[0]
-        key = space + "_center"
+        if isinstance(unit, UnitFiber):
+            key = f"{unit.name}_center"
+        else:
+            space = unit.name.split("_")[0]
+            key = space + "_center"
         ary = self._cached_array.get(key)
 
         shape = self.get_shape(shape)
@@ -966,7 +973,10 @@ def delta_array(self, shape=None, unit="2th_deg", scale=False):
         """
 
         unit = to_unit(unit)
-        space = unit.name.split("_")[0] + "_delta"
+        if isinstance(unit, UnitFiber):
+            space = f"{unit.name}_delta"
+        else:
+            space = unit.name.split("_")[0] + "_delta"
         ary = self._cached_array.get(space)
 
         shape = self.get_shape(shape)