mojo: Fix map of booleans for python bindings.

mojo/public/python/mojo/bindings/descriptor.py

Index: mojo/public/python/mojo/bindings/descriptor.py
diff --git a/mojo/public/python/mojo/bindings/descriptor.py b/mojo/public/python/mojo/bindings/descriptor.py
index 0c97c06e8370ae91679b38e10969e17d38b7434d..44c0f395432f273298aebc50c8740be6fb8880a6 100644
--- a/mojo/public/python/mojo/bindings/descriptor.py
+++ b/mojo/public/python/mojo/bindings/descriptor.py
@@ -416,8 +416,8 @@ class MapType(SerializableType):
       '__module__': __name__,
       'DESCRIPTOR': {
         'fields': [
-          SingleFieldGroup('keys', GenericArrayType(key_type), 0, 0),
-          SingleFieldGroup('values', GenericArrayType(value_type), 1, 1),
+          SingleFieldGroup('keys', MapType._GetArrayType(key_type), 0, 0),
+          SingleFieldGroup('values', MapType._GetArrayType(value_type), 1, 1),
         ],
       }
     }
@@ -452,6 +452,13 @@ class MapType(SerializableType):
       return dict(zip(s.keys, s.values))
     return None
 
+  @staticmethod
+  def _GetArrayType(t):
+    if t == TYPE_BOOL:
+      return BooleanArrayType()
+    else:
+      return GenericArrayType(t)
+
 
 class NoneType(SerializableType):
   """Placeholder type, used temporarily until all mojo types are handled."""