diff --git a/easypy/caching.py b/easypy/caching.py
index f29bbca..7463820 100644
--- a/easypy/caching.py
+++ b/easypy/caching.py
@@ -181,6 +181,10 @@ class _CachedException(tuple):
     pass
 
 
+def _default_key_func(*args, **kwargs):
+    return _make_key(args, kwargs, False)
+
+
 class _TimeCache(DecoratingDescriptor):
 
     def __init__(self, func, **kwargs):
@@ -196,8 +200,7 @@ def __init__(self, func, **kwargs):
 
         key_func = kwargs['key_func']
         if not key_func:
-            def key_func(*args, **kwargs):
-                return _make_key(args, kwargs, False)
+            key_func = _default_key_func
         self._key_func = key_func
 
         self.NOT_FOUND = object()
@@ -210,7 +213,11 @@ def key_func(*args, **kwargs):
     def make_key(self, args, kwargs):
         bound = self.sig.bind(*args, **kwargs)
         _apply_defaults(bound)
-        return kwargs_resilient(self._key_func)(**bound.arguments)
+
+        if self._key_func is _default_key_func:
+            return self._key_func(**bound.arguments)
+        else:
+            return kwargs_resilient(self._key_func)(**bound.arguments)
 
     def key_func(self, func):
         """
diff --git a/easypy/logging/_logbook.py b/easypy/logging/_logbook.py
index 2eabd02..0657db2 100644
--- a/easypy/logging/_logbook.py
+++ b/easypy/logging/_logbook.py
@@ -227,10 +227,10 @@ def process(self, record):
         if extra is not None:
             decoration = extra.pop('decoration', decoration)
 
-        contexts = THREAD_LOGGING_CONTEXT.context
         extra = THREAD_LOGGING_CONTEXT.flatten()
-        extra['context'] = "[%s]" % ";".join(contexts) if contexts else ""
+        contexts = extra['context']
         record.extra.update(extra)
+        record.extra['context'] = "[%s]" % ";".join(contexts) if contexts else ""
         indentation = record.extra['indentation']
 
         indents = chain(repeat(G.graphics.INDENT_SEGMENT, indentation), repeat(decoration, 1))
diff --git a/easypy/threadtree.py b/easypy/threadtree.py
index 7e84eaa..446e31a 100644
--- a/easypy/threadtree.py
+++ b/easypy/threadtree.py
@@ -487,7 +487,7 @@ def _get_context_data(self, thread_uuid=None, combined=False):
         parent_uuid = get_parent_uuid(thread_uuid)
         if parent_uuid:
             parent_ctx = self._get_context_data(parent_uuid, combined=True)
-            ctx = deepcopy(parent_ctx) + ctx
+            ctx = parent_ctx + ctx
         return ctx
 
     def get(self, k, default=None):