Add a max_dynamic_params_depth setting to limit recusive searching for those params. It shouldn't be too crazy.

jedi/settings.py

@@ -63,6 +63,7 @@ definitely worse in some cases. But a completion should also be fast.
 .. autodata:: max_function_recursion_level
 .. autodata:: max_executions_without_builtins
 .. autodata:: max_executions
+.. autodata:: max_dynamic_params_depth
 .. autodata:: scale_call_signatures
 
 
@@ -207,6 +208,12 @@ max_executions = 250
 A maximum amount of time, the completion may use.
 """
 
+max_dynamic_params_depth = 3
+"""
+A maximum amount of a recursive search function calls, when the type of a
+parameter is needed.
+"""
+
 scale_call_signatures = 0.1
 """
 Because call_signatures is normally used on every single key hit, it has